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Definition of other man
: a man with whom a married woman has an affair
—usually used with the E.G. Marshall plays a man who, believing himself cuckolded, plants a bomb in his own basement to destroy the Mrs. and the other man.— Mike Flaherty
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Merriam-Webster unabridgedWords at Play
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Time Traveler for other man
The first known use of other man was in 1886
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