CHEATON

Be unfaithful to one's partner (5,2)

Solution has appeared in 2 crosswords (0 across and 2 down):

• Quick crossword No 15,954 — 2021-06-24 23:00:10
  16D: Betray sexually (5,2)
• Quick crossword No 15,541 — 2020-02-28 00:00:01
  7D: Be unfaithful to one's partner (5,2)