kink

(noun) a painful muscle spasm especially in the neck or back (`rick' and `wrick' are British). Synonyms: crick, rick, wrick.

(noun) a sharp bend in a line produced when a line having a loop is pulled tight. Synonyms: twist, twirl.

(noun) a person with unusual sexual tastes.

(noun) an eccentric idea.

(noun) a difficulty or flaw in a plan or operation. Examples: "There are still a few kinks to iron out."

(verb) curl tightly. Synonyms: crimp, crape, frizzle, frizz, kink up. Examples: "Crimp hair."

(verb) form a curl, curve, or kink. Synonyms: curl, curve. Examples: "The cigar smoke curled up at the ceiling."