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Phrase for love or money "for anything" is attested from 1580s.
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The sense "no score" (in tennis, etc.) is 1742, from the notion of playing for love (1670s), that is, for no stakes. Meaning "a beloved person" is from early 13c.
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The weakened sense "liking, fondness" was in Old English. The Germanic words are from PIE root *leubh- "to care, desire, love." Old English lufu "feeling of love romantic sexual attraction affection friendliness the love of God Love as an abstraction or personification," from Proto-Germanic *lubo (source also of Old High German liubi "joy," German Liebe "love " Old Norse, Old Frisian, Dutch lof German Lob "praise " Old Saxon liof, Old Frisian liaf, Dutch lief, Old High German liob, German lieb, Gothic liufs "dear, beloved").
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