The Collaborative International Dictionary of English v.0.48:

Kink \Kink\, n. [D. kink a bend or turn, or Sw. kink.]
   [1913 Webster]
   1. A twist or loop in a rope or thread, caused by a
      spontaneous doubling or winding upon itself; a close loop
      or curl; a doubling in a cord.
      [1913 Webster]

   2. An unreasonable notion; a crotchet; a whim; a caprice.
      [Colloq.] --Cozzens.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Kink \Kink\, v. i. [imp. & p. p. Kinked; p. pr. & vb. n.
   Kinking.]
   To wind into a kink; to knot or twist spontaneously upon
   itself, as a rope or thread.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Kink \Kink\, n. [Cf. Chincough, Kink-haust.]
   A fit of coughing; also, a convulsive fit of laughter.
   [Scot.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

kink
    n 1: a painful muscle spasm especially in the neck or back
         (`rick' and `wrick' are British) [syn: crick, kink,
         rick, wrick]
    2: a sharp bend in a line produced when a line having a loop is
       pulled tight [syn: kink, twist, twirl]
    3: a person with unusual sexual tastes
    4: an eccentric idea
    5: a difficulty or flaw in a plan or operation; "there are still
       a few kinks to iron out"
    v 1: curl tightly; "crimp hair" [syn: crimp, crape,
         frizzle, frizz, kink up, kink]
    2: form a curl, curve, or kink; "the cigar smoke curled up at
       the ceiling" [syn: curl, curve, kink]