AFFAIR
NOUNS
1474 — BESOIGNE affair, business, duties, ado → obs.
..L17 — ASSIGNATION a rendezvous for illicit romance or sex with a lover or prostitute
..20C — ASSIGNATION HOUSE a place to meet for an illicit romance; any ‘house’ or hotel where such meetings take place → sl.
..20C — BACHIE a room or any small place kept by a man for sole living or for conducting love affairs away from the family home → W. Indies
..20C — WHING-DING → WING-DING an affair or sexual encounter → US
1952 — TRYSTING-OUT a clandestine meeting between a married man and a married woman who are not married to each other → Amer. dial.
1963 — ONE-NIGHT STAND a brief affair or sexual liaison → sl.
1977 — BIT ON THE SIDE a love affair; extra-marital sex → UK sl.
NOUNS, PERSON
1900 — BABY-SNATCHER a person who has a sexual relationship with a much younger partner → derogatory
1963 — ONE-NIGHT STAND a person with whom one has a brief affair → sl.
1968 — BEARD a person who helps two people to conceal a clandestine love affair by escorting one of them in public → sl., orig. US
1979 — BABY-FARMER an older person, usually a woman, who prefers affairs with people much younger than themselves → sl.
VERBS
..20C — DATE → DATE UP to have an affair with someone; to be going out together on a number of pre-arranged days → sl., orig. US
1920 — RUN AROUND to carry on sexual affairs, deceiving one’s primary partner → orig. US
1930 — WALK OUT TOGETHER to have a clandestine affair → UK society sl.
1930 — WALK OUT WITH to have a clandestine affair → UK society sl.
1960 — JAUL → JAWL → JOL to have an affair with; to flirt; to ‘carry on’ → S. Afr.
1974 — HANG ONE ON to have an affair → US
sl.
..L20 — HAVE A BIT ON THE SIDE to indulge in an extramarital affair → colloq.
2006 — KICK IT WITH SOMEONE to be sexually involved with someone, esp. to have an affair → African-American sl.
Lexicophilia 