Vocabulary
自分の首を絞める
じぶんのくびをしめる
to cut one's own throat; to dig one's own grave; to cause oneself harm; to bring ruin on oneself
expression
verb
Example sentences
もし彼（かれ）にそんなことをするなら、君（きみ）は自分（じぶん）の首（くび）をしめることになるぞ。
If you do that to him, he will cut your throat.