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the seven-year itch
The supposed inclination of a person, typically a man, to begin longing for sexual relations with other people after seven years of marriage. Everyone warned me about the seven-year itch, but I've been completely content with my wife every second that we've been together. A: "I heard Jack has been having an affair with a bartender from across town." B: "Hmm, sounds like the seven-year itch to me."
a real or imagined longing for other women in a man's seventh year of marriage. Looks like Jack has the seven-year itch. The seven-year itch is just a rumor.
the seven year ˈitch(informal) the wish for a new sexual partner because you are bored with your husband or wife: He’s started looking at all the women in the office. It must be the seven year itch.
n. a real or imagined longing for other women in a man’s seventh year of marriage. Looks like Jack has the seven-year itch.