the seven-year itch
idiomPart ofseven
the seven-year itch — idiom
1. the idea that after about seven years of marriage, one partner may become bored
1.idiom
Definition
the idea that after about seven years of marriage, one partner may become bored and want a new relationship or experience.
Example
The movie 'The Seven Year Itch' with Marilyn Monroe popularized the idea of marital restlessness.
Some couples joke about the seven-year itch when they reach their anniversary.