From Late Middle English *amusen, from Old French amuser, from a- + muser, of uncertain and obscure origin. Cognate with Occitan musa ("idle waiting"), Italian musare ("to gape idly about"). Possibly from Old French *mus ("snout") from Vulgar Latin *mūsa ("snout") — compare Medieval Latin mūsum –, from Proto-Germanic *mū- ("muzzle, snout"), from Proto-Indo-European *mū- ("lips, muzzle"). Compare North Frisian müs, mös, German Maul ("muzzle, snout").
Alternative etymology connects muser and musa with Frankish *muoza ("careful attention, leisure, idleness"), from Proto-Germanic *mōtǭ ("leave, permission"), from Proto-Indo-European *med- ("to acquire, possess, control").
This would make it a cognate of Dutch musen ("to leisure"), Old High German *muoza ("careful attention, leisure, idleness") and muozōn, German Muße ("leisure"). More at empty.
Modern English dictionary
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