expression, godan verb (-ru)
hang oneself; strangle oneself
Refers to the act of committing suicide by hanging or self-strangulation. Often used in literal contexts, but can appear metaphorically in expressions about being in a desperate situation.
彼は借金に追われて首をくくった。
He hanged himself, driven by debt.
そんなに悩むくらいなら首を
He was so distressed that he thought he had no choice but to hang himself.