expression, ichidan verb
cut one's own throat; dig one's own grave; bring ruin on oneself
Idiomatic expression meaning to do something that ends up harming oneself, often through one's own words or actions.
あんな発言をしたら、自分の首を絞めることになるよ。
If you make a remark like that, you'll be digging your own grave.
値下げ競争は結局、自分の首を絞めるだけだ。
A price war will only end up cutting your own throat.