From Middle English slombren, slomren, frequentative of Middle English slummen, slumen, probably from Middle English slume, from Old English slūma, from Proto-Germanic *slūm- ("slack, loose, limp, flabby"), from Proto-Indo-European *(s)lew-, equivalent to sloom + -er. Cognate with West Frisian slommerje, slûmerje, Dutch sluimeren, German schlummern.
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