cop off
phrasal verb with cop verb [ T ] uk/kɒp/ us/kɑːp/ -pp-
UK informal
与某人成为情侣;成双结对
to begin a sexual relationship with someone
She copped off with him at a party. 她在一次聚会上与他打得火热。
A lot of people were copping off. 许多人成双成对地结为情侣。