Knack"er (?), n. 1. One who makes knickknacks, toys, etc. Mortimer.

2. 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.

Knack"er, n. [Cf. Icel. hnakkr a saddle.] 1. a harness maker. [Obs. or Prov. Eng.] Halliwell.

2. One who slaughters worn-out horses and sells their flesh for dog's meat. [Eng.]

• One who makes knickknacks, toys, etc.
  
• 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.
  
• a harness maker.
  
• One who slaughters worn-out livestock (especially horses) and sells their flesh, bones and hides.
  
• One who dismantles old ships, houses etc. and sells their components.
  
• (In Ireland and Britain) Offensive name for a member of the Travelling community; gypsies.
  
• (In Ireland) Slang term used to describe something in disgust.
  
• To tire out, become exhausted
        Carrying that giant statue up those stairs knackered me out
  

German
• "alter Knacker": geezer