knap

Concise Oxford English Dictionary © 2008 Oxford University Press:
knap1 /nap/

▶noun archaic the crest of a hill.

– origin OE cnæpp, cnæp.

Concise Oxford English Dictionary © 2008 Oxford University Press:
knap2 /nap/

▶verb (knaps, knapping, knapped)

• 1 Architecture & Archaeology shape (a stone) by striking it, so as to make a tool or a flat stone for building walls.

• 2 archaic knock.

– derivatives
knapper noun.

– origin ME: imitative.