Number two
Reference
Definition
“Number two” is a slang term for a mistress: a woman involved in an extramarital relationship, generally including sexual relations.
Quick Facts
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What does “number two” mean?
In relationship slang, “number two” refers to a mistress—the other woman in an extramarital relationship, generally involving sexual relations.
How it is used
The phrase describes a person positioned outside someone’s marriage or primary relationship. It is used as a noun for the mistress in that relationship.