cut your own throat
US /kʌt jʊər oʊn θroʊt/
UK /kʌt jʊər oʊn θroʊt/
1.
to do something that will cause your own failure or downfall
:
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If you refuse to cooperate with your team, you'll be cutting your own throat.
•
Raising prices too much could cut your own throat by driving customers away.