From Middle English bosom, bosum, from Old English bōsm, from Proto-West Germanic *bōsm, from Proto-Germanic *bōsmaz, from Proto-Indo-European *bʰewH-. Cognate with Saterland Frisian Bossem, Bousem, West Frisian boezem, Dutch boezem, German Busen. Related also to Albanian buzë, Greek βυζί, Romanian buză, Irish bus, and Latin bucca.
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