Idiom Definition:
Your browser does not support the audio element.
"to have an affair (with someone)"
when a person, who is married or in a committed monogamous relationship, has sex or an intimate relationship with a person other than their partner.
Synonyms:
adultery, cheat, cheating, entanglement, extra-marital, illicit, fling, goings-on, hanky-panky, infidelity, intrigue, liaison, love, matinée, relationship, romance, thing, two-timing, unchaste, unfaithful
Both of these people are married to other people, therefore they are
having an affair. - - - - ->