Louse

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google

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Old English lūs, (plural) lȳs, of Germanic origin; related to Dutch luis, German Laus .


文件:Ety img louse.png

wiktionary

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From Middle English lous, lows, lowse, from Old English lūs, from Proto-Germanic *lūs (compare West Frisian lûs, Dutch luis, German Low German Luus, German Laus), from Proto-Indo-European *lewH- (compare Welsh llau(“lice”), Tocharian B luwo, maybe Sanskrit यूका(yūkā)).


etymonline

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louse (n.)

parasitic insect infesting human hair and skin, Old English lus, from Proto-Germanic *lus (source also of Old Norse lus, Middle Dutch luus, Dutch luis, Old High German lus, German Laus), from PIE *lus- "louse" (source also of Welsh lleuen "louse").

The meaning "obnoxious person" is from 1630s. The plural lice (Old English lys) shows effects of i-mutation. Grose ["Dictionary of the Vulgar Tongue," 1785] has louse ladder "A stitch fallen in a stocking."




louse (v.)

late 14c., "to clear of lice," from louse (n.). Compare delouse. Related: Loused; lousing. To louse up "ruin, botch" first attested 1934, from a literal sense (in reference to bedding), from 1931.