From Middle English loken, lokien, from Old English lōcian, from Proto-West Germanic *lōkōn. Further origin unknown, no certain cognates outside Germanic. The English word, however, is cognate with Scots luke, luik, leuk, West Frisian lôkje, loaitsje, Dutch loeken, German Low German löken, Alemannic German luege, German lugen, Yiddish לוגן. Possibly related to Sanskrit लोक् *lewk- in the sense of "illuminating" (cf. related word रुच् "to shine, illuminate")
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