Real Dictionary

kink
countable noun: A kink is a curve or twist in something which is otherwise or normally straight.
verb: If something kinks or is kinked, it has, or it develops a curve or twist in it.

kink in American English
a short twist, curl, or bend in a thread, rope, hair, wire, etc.
to form or cause to form a kink or kinks
to form, or cause to form, a kink or kinks, as a rope
noun: a twist or curl, as in a thread, rope, wire, or hair, caused by its doubling or bending upon itself

kink in British English
noun: a sharp twist or bend in a wire, rope, hair, etc, esp one caused when it is pulled tight
verb: to form or cause to form a kink