Meaning of the word "have an affair" in English

What does "have an affair" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

have an affair

US /hæv ən əˈfer/
UK /hæv ən əˈfeə/

Idiom

to have a sexual relationship with someone who is not your husband, wife, or usual partner

Example:
He confessed to his wife that he had been having an affair with his colleague.
Rumors started circulating that the politician was having an affair.