Meaning

originPerhaps a variant of nap for knap, from Middle English knep, kneppe, knappe, a conflation of Old English cnep, cnæp, cnæpp (“top, knop, summit”) and Old Norse knappr (“knob”), both from Proto-Germanic *knappaz, *knappô (“knob”), from Proto-Indo-European *gnebʰ- (“to press, tighten”), from Proto-Indo-European *gen- (“to pinch, squeeze, bend, press together, ball”). Compare also Old Norse hnappr…

Etymology from Wiktionary, CC BY-SA 3.0