Question

have an affair His wife is having an affair. e.g.She divorced her husband after she discovered that he was having an affair.

Accepted Answer

one of married couples who have sex with a different person.We can also say that they are cheating on their spouse.

collocation	have an affair
definition	one of married couples who have sex with a different person.We can also say that they are cheating on their spouse.
examples	His wife is having an affair. e.g.She divorced her husband after she discovered that he was having an affair.

Affair Married Couples Sex Person.We Cheating Spouse Wife