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sleep[sleep 词源字典]

sleep: [OE] Sleep comes from a prehistoric West Germanic *slǣpan, which also produced German schlafen and Dutch slapen. Its ancestry has not been pieced together in detail, but it is related to Dutch slap ‘sluggish’ and German schlaff ‘slack, loose’, and a link has been suggested with Lithuanian slabnas ‘weak’.
[sleep etymology, sleep origin, 英语词源]