crutch

crutch /kr'ʌtʃ/ (crutches)
1 [N-COUNT] usu pl, oft on N
A crutch is a stick whose top fits round or under the user's arm, which someone with an injured foot or leg uses to support their weight when walking.
I can walk without the aid of crutches...
I was on crutches for a while.
2 [N-SING]
If you refer to someone or something as a crutch, you mean that they give you help or support.
He gave up the crutch of alcohol.
3 [N-COUNT]
Your crutch is the same as your crotch. (mainly BRIT)
He kicked him in the crutch.