One who makes knickknacks, toys, etc. Mortimer. [1913 Webster]
One of two or more pieces of bone or wood held loosely between the fingers, and struck together by moving the hand; -- called also clapper. Halliwell. [1913 Webster]
knacker, n. [Cf. Icel. hnakkr a saddle.].
a harness maker. Halliwell. [1913 Webster]
One who slaughters worn-out horses and sells their flesh for dog's meat. [1913 Webster]
knacker, n. & v. Brit.
--n.
1 a buyer of useless horses for slaughter.
2 a buyer of old houses, ships, etc. for the materials.
--v.tr. sl.
1 kill.
2 (esp. as knackered adj.) exhaust, wear out.