Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
NAP, v.1 To make a gentle snap at with the teeth, to nibble, esp. of horses nipping one another's necks in a caressing way (Ork. 1929 Marw.; Ork., Cai. 1963).
[A variant of Knap, v.4 Cf. also Norw. dial. nappa, to snap, pluck.]