Basic Guidelines For English Spellings
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1A young woman who assents to romantic or sexual proposals; a promiscuous woman.
2A young woman who habitually agrees with or assents to the proposals of a superior; an obsequiously deferential young woman. Usually depreciative. Compare "yes-man", yes-woman .
1920s; earliest use found in Des Moines (Iowa) News. From yes + girl, after yes-woman.