Webster's English Dictionary

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nap

1. nap \'nap\ vi or napped;  or nap.ping [ME nappen, fr. OE knappian; akin 
   to OHG hnaffezen to doze] 1: to sleep briefly esp. during the day : DOZE  
   2: to be off guard 
2. nap n : a short sleep esp. during the day : SNOOZE 
3. nap \-l*s\ \'napt\ n [ME noppe, fr. MD, flock of wool, nap; akin to OE 
   hnoppian to pluck], Gk konis ashes - more at INCINERATE : a soft downy 
   fibrous surface (as on yarn)  - nap.less aj
4. nap vt or napped;  or nap.ping : to raise a nap on (fabric or leather)