Definition of knapped:
(v) :
(transitive) To break (something) into small pieces with a cracking sound; to fragment, to smash; also, to break (something) apart sharply; to snap.
(v) :
(transitive) (specifically, especially archaeology) To break away flakes from (a brittle material which fractures conchoidally (“with planar concentric curves”), usually a mineral such as chert, flint, or obsidian), often to form a tool with a sharp edge or point.
(v) :
(transitive) To strike (something) sharply; to knock, to rap.
(v) :
(transitive) Followed by off: to break (something) away from another thing by striking or tapping sharply.
(v) :
(transitive) (figurative) To say (something) crisply or sharply.
(v) :
(intransitive) To break or fracture suddenly; to snap.