left-handed wife
obsolete A woman who maintains a sexual relationship with a married man; a mistress. You're just his left-handed wife, so you realize that you have no claim to his financial assets, right? The former governor had been predicted to win the presidential election in a landslide, until it came out that he had a left-handed wife. Then, he started tanking in the polls.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.