nock /ˈnɑk/
  弓的兩端挂弦的位置;帆的前部上端
  Nock n.
  1. A notch.
     He took his arrow by the nock.   --Chapman.
  2. Naut. The upper fore corner of a boom sail or of a trysail.
  Nock, v. t. To notch; to fit to the string, as an arrow; to string, as a bow.
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  nock
       v : make small marks into the surface of; "score the clay before
           firing it" [syn: score, mark]