Reverse Dictionary: BETRAY

ADJECTIVES
1475 ► PRODITORIOUS apt to betray or reveal what is hidden or in the mind; treacherous, traitorous, perfidious → obs.
1655 ► BURNED betrayed; cheated 

NOUNS
1385 ► BETRAISING betraying → obs.
1450 ► JUDAS KISS a kiss or other apparent gesture of friendship which is in fact an act of betrayal
1548 ► BETRAYMENT betrayal 
1600 ► BETRAY betrayal; a treacherous giving up to an enemy → obs.
1882 ► DEAD GIVE-AWAY a complete betrayal; a notable betrayal of guilt, or defect → US colloq.
1922 ► STAB IN THE BACK a treacherous betrayal → sl.
1930 ► XX a betrayal, double-cross → US sl.
1950 ► QUICK ONE an unexpected act of betrayal → US sl.
1990 ► GAFFLE betrayal, defeat, failure → African-American sl.
1996 ► SHELF JOB an informing; betrayal of confederate → Aust. criminals’ sl.

NOUNS, PERSON
1000 ► JUDAS a person who betrays his or her comrades or associates, frequently under the guise of friendship; a traitor, a betrayer
1000 ► LORDSWIKE a person who betrays his or her lord; a traitor → obs.
1440 ► BEWRAYER a betrayer; he who bewrays or reveals; a person who discovers a thing which should be concealed 
1581 ► SINON a betrayer or deceiver; a person who misleads by false tales; a perfidious person 
1582 ► JUDASITE a person who emulates or supports the actions of Judas Iscariot, esp. in betraying a person or cause
1725 ► STAG a person who betrays associates to the police or other authorities; an informer → sl.
1812 ► SPLIT a person who betrays associates to the police or other authorities; an informer → sl.
1845 ► STOOL-PIGEON a person who betrays associates to the police or other authorities; an informer → sl., orig. US
1855 ► BECHER a betrayer → obs. (Bk.)
1865 ► SQUEALER a person who betrays associates to the police or other authorities; an informer → sl.
1885 ► PIMP a person who betrays associates to the police or other authorities; an informer → Aust. & NZ sl.
1889 ► TATTLE-TALE a person who betrays or informs on others; a telltale; a talebearer; a whistle-blower → colloq., orig. US
1895 ► FIZGIG → PHIZGIG a person who betrays associates to the police or other authorities; an informer → Aust. sl.
1897 ► SARBOT → SARBUT a person who betrays associates to the police or other authorities; an informer → Eng. dial.
1902 ► RAT a person who betrays associates to the police or other authorities; an informer → sl.
1903 ► SCREAMER a person who betrays associates to the police or other authorities; an informer → sl.
1903 ► SQUEAKER a person who betrays associates to the police or other authorities; an informer → sl.
1906 ► STOOL a person who betrays associates to the police or other authorities; an informer → US sl.
1906 ► STOOLIE a person who betrays associates to the police or other authorities; an informer → US sl.
1914 ► FINGER a person who betrays associates to the police or other authorities; an informer → sl.
1916 ► SHELF a person who betrays associates to the police or other authorities; an informer → Aust. sl.
1916 ► SHELFER a person who betrays associates to the police or other authorities; an informer → Aust. sl.
1925 ► MOAT a betrayer; an informer → US criminals’ sl.
1932 ► GRASS a person who betrays associates to the police or other authorities; an informer → sl., orig. Brit.
1935 ► SINGER a person who betrays associates to the police or other authorities; an informer → sl.
1940 ► ARMY WORM a person who betrays a trust; an informer → World War II Amer. sl.
1941 ► TOP-OFF → TOP-OFF MAN → TOP-OFF MERCHANT a person who betrays associates to the police or other authorities; an informer → Aust. sl.
1943 ► FIZZ a person who betrays associates to the police or other authorities; an informer → Aust. sl.
1943 ► FIZZER → PHIZZER a person who betrays associates to the police or other authorities; an informer → Aust. sl.
1949 ► PIGEON a person who betrays associates to the police or other authorities; an informer → sl.
1950 ► GRASSER a person who betrays associates to the police or other authorities; an informer → Brit. sl.
1960 ► MOONLIGHTER a person who betrays their regular partner → US teen sl.
1969 ► DOG a person who betrays his or her associates; an informer → sl.
1976 ► BAG-O-WIRE a betrayer; an informer → W. Indies Rasta usage
1982 ► MOSER a betrayer; an informer; a stool pigeon → Jewish (Bk.)
1984 ► GIG a person who betrays associates to the police or other authorities; an informer → Aust. sl.
1992 ► BALLPLAYER a person who betrays his accomplices to authorities → criminals’ sl. (Bk.)

VERBS
..971 ► BESWIKE to betray, to cheat, to deceive → obs.
1000 ► BELEWE to betray → obs.
1300 ► BETRAISE → BETRAISH to betray → obs.
1300 ► DECEIVE to betray, to be or prove false to, to play false, to deal treacherously with → obs.
1374 ► FALSE to betray, to deceive; to play false to a person; to betray → obs.
1375 ► BETRADE to betray → obs.
1400 ► ACCUSE to betray, to disclose; hence, to reveal, to display, to show or make known 
1400 ► BE BOUGHT AND SOLD to be betrayed for a bribe → arch.
1400 ► BETRAUT to betray → N. Eng. dial. obs.
1535 ► BEWRAY to betray, to reveal the presence of, or expose a fugitive to his enemies, or to justice → obs.
1539 ► TELL to betray an associate to the police or other authority; to inform on; to incriminate 
1554 ► SAVOUR OF THE PAN to betray its origin 
1602 ► BOIL to betray → sl. obs.
..18C ► SNITCH → SNITCH OFF → SNITCH OUT to betray, to inform 
1725 ► TURN STAG to betray 
1795 ► SPLIT to betray an associate to the police or other authority; to inform on; to incriminate 
1819 ► JACKET to betray, to cheat; to swindle → sl.
1839 ► STAG to betray an associate to the police or other authority; to inform on; to incriminate 
1846 ► TURN DOG ON to betray → US & Aust. sl.
.M19 ► SPLIT ABOUT to betray, to inform, esp. to the police → sl.
1858 ► PUT AWAY to inform against, to betray; to give a person up to the police → sl.
1866 ► FUCK to cheat; to deceive, to betray → sl.
1891 ► GAG → GAG ON to betray, to inform on a person → UK sl.
1894 ► SELL DOWN THE RIVER to betray → sl., orig. African-American
1898 ► BLENCH to betray; to impeach → Eng. dial. (Bk.)
1899 ► SHOP to betray an associate to the police or other authority; to inform on; to incriminate → sl., chiefly Brit.
1903 ► CHEEP to betray a secret; to tell or reveal; to mention, to hint at → Amer. dial.
1905 ► QUATCH to betray; to tell a secret → Eng. dial. (Bk.)
1907 ► POOL to betray, often implying incrimination → Aust. sl.
1911 ► PEEP to betray an associate to the police or other authority; to inform on; to incriminate → sl.
1911 ► POT to betray an associate to the police or other authority; to inform on; to incriminate → Aust. sl
1913 ► DO ONE DIRT to injure one in a contemptible way, esp. betrayal → Amer. dial. (Bk.)
1914 ► DO THE DIRTY ON to betray → Brit. sl.
1916 ► STAB IN THE BACK to betray, implying harming someone in a treacherous way → sl.
1920 ► RANK to betray, to let down → US sl.
1923 ► SNOUT to betray an associate to the police or other authority; to inform on; to incriminate → sl.
1924 ► PUT THE FINGER ON to betray an associate to the police or other authority; to inform on; to incriminate → sl., orig. US
1924 ► TALK to betray an associate to the police or other authority; to inform on; to incriminate → sl.
1924 ► TWO-TIME to betray, to deceive or be unfaithful to someone, esp. a partner or lover → sl., orig. US
1926 ► TURN SOMEONE IN to betray, to give someone up to the police → sl.
1928 ► PULL THE RUG (OUT) FROM UNDER to betray, to unexpectedly withdraw support from; to destroy the basis of → colloq.
1930 ► FINGER to betray an associate to the police or other authority; to inform on; to incriminate → sl., orig. US
1930 ► PUT A FINGER ON to betray, esp. to the police → US sl.
1934 ► BLOW THE WHISTLE ON to betray, implying a revelation of what others had wanted kept secret → sl.
1934 ► SCRIX to betray → sl. (Bk.)
1936 ► GRASS to betray an associate to the police or other authority; to inform on; to incriminate → sl., orig. Brit.
1936 ► SHELF to betray an associate to the police or other authority; to inform on; to incriminate → Aust. sl.
1938 ► OFFSET to betray, to deceive or harm someone → Amer. dial.
1941 ► DINGO ON to betray, to let down, to ‘rat’ on a person → Aust. sl.
1943 ► SHEG to cheat or betray → W. Indies
1945 ► TURN DINGO ON to betray someone → Aust. sl.
1950 ► EAT CHEESE to betray, to inform on → US sl.
1955 ► DOB IN to betray, implying incrimination; to inform against or report, esp. to the police → Aust. & NZ colloq.
1960 ► BUDDY-FUCK to betray, impose on, otherwise inconvenience a friend → US, chiefly military usage
1960 ► LABA-LABA → LABBA-LABBA to betray secrets; to chatter, to gossip → W. Indies
1960 ► SCREAM ON ONE to betray the confidence of someone; to tell; to inform; to attack → African-American sl.
1963 ► TELL OFF ON to betray, to inform on ╬ Amer. dial.
1964 ► CROAK to betray, to inform on someone → US sl.
1966 ► STICK IT UP SOMEONE’S ASS to betray, to brutally manhandle, or victimize someone → Amer. sl.
1966 ► TUCK IT UP SOMEONE’S ASS to betray, to brutally manhandle, or victimize someone → Amer. sl.
1970 ► DIME to betray, to inform on → US sl.
1970 ► SPEW to betray, to inform on → US prison sl.
1970 ► ZOOM SOMEONE OFF to betray someone emotionally, to deceive → African-American sl.
1971 ► SHOVE IT UP SOMEONE’S ASS to betray, to brutally manhandle, or victimize someone → Amer. sl.
1974 ► RAT to betray, to abandon, or desert any person or thing → sl.
1979 ► BUTT-FUCK to betray, to deceive, to cheat; to treat unfairly → sl.
1980 ► TAKE IT IN THE ASS to betray, to be brutally manhandled, or victimized → Amer. sl.
1994 ► THROW UNDER THE BUS to betray a person, esp. a colleague or friend, in order to protect or advance one’s own interests; to make a scapegoat of → colloq.
1999 ► WELSH ON to betray; to inform on; to fail to honour debts → Aust. sl. (Bk.)
2006 ► TOSS UNDER THE BUS to betray a person, esp. a colleague or friend, in order to protect or advance one’s own interests; to make a scapegoat of → colloq.