Reverse Dictionary: UPSTART

ADJECTIVES
► COCKHORSE exultant; proud; upstart → 1598 obs.
► MUSHROOMIC upstart → 1859

NOUNS – PERSON
► ALECK an impudent person, an upstart  → 1908 US sl.
► BEGGAR ON HORSEBACK an upstart; a person suddenly raised in social status and rendered giddy by his promotion → 1922 (Bk.)
 BOUNDER a vulgar upstart → 1981 Aust. colloq. (Bk.)
► CHITTYPRAT a pet name for a child; a little upstart → 1892 Eng. dial.
► GENTLEMAN OF FOUR OUTS ► GENTLEMAN WITH FOUR OUTS an upstart, without manners, wit, money, or credit → 1864 UK sl. (Bk.)
► GENTLEMAN OF THE FIRST HEAD a term of contempt; an upstart gentleman; an imitator of the upper classes → 1611 obs.
► GENTLEMAN OF THE FIRST HOUSE a term of contempt; an upstart gentleman; an imitator of the upper classes → 1625 obs.
► JACKANAPES one who is like an ape in tricks, airs, or behaviourl a ridiculous upstart; an impudent person; a pert, impertinent fellow who assumes ridiculous airs; a conceited coxcomb → 1534
► JACK-GENTLEMAN a man of low birth or manners making pretensions to be a gentleman; an insolent fellow, an upstart → 1667 obs.
► JACK-GENTLEWOMAN a  woman of low birth or manners making pretensions to be a gentlewoman; an insolent woman, an upstart → 1787 obs.
► JACK-IN-OFFICE an overbearing petty official; an upstart → 1690 sl.
► JACK IN THE PULPIT a pretender; an upstart → 1896 colloq. (Bk.)
► MOXIE ► MOXY an impudent upstart → 1968 African-American sl.
► PARVE a parvenu, a person from a humble background who has rapidly gained wealth or an influential social position; a nouveau riche; an upstart, a social climber → 1980s Aust. sl.
► POT-WALLOPER a fool, a stupid person; also, an impostor, an upstart → 1820 derogatory
► QUICK-START an upstart → 1874 Eng. dial.
► SKIPJACK an upstart → 1776 US
► SNOIT a young, conceited person, who speaks little; an upstart, a swaggerer; one who goes where he has no right to go, an intruder → 1824 Sc. obs.
► SNOTNOSE an importunate upstart; a neophyte, esp. a knowing one → 1941 Amer. sl.
► SNOTTYNOSE an importunate upstart; a neophyte, esp. a knowing one; an obnoxious person → 1941 sl.
► TIPPERTANT ► TIPPERTAUNT a young upstart → 1891 Eng. dial.
► UPJUMP an upstart, a nouveau riche; a term of abuse → 1910 Aust. sl.
► UP-SPROUT an upstart → 1905 Eng. dial. (Bk.)
► WICK-START an upstart → 1874 Eng. dial. 
► YIP-YAP ► YIP-YOP an upstart; a young, scatterbrained person → 1877 Eng. dial. (Bk.)