cut your own throat
US /kʌt jʊər oʊn θroʊt/
UK /kʌt jʊər oʊn θroʊt/

1.
自掘坟墓, 自毁前程
to do something that will cause your own failure or downfall
:
•
If you refuse to cooperate with your team, you'll be cutting your own throat.
如果你拒绝与团队合作,你就是在自掘坟墓。
•
Raising prices too much could cut your own throat by driving customers away.
价格涨得太高可能会自毁前程,把顾客都赶走。