dig your own grave

US /dɪɡ jʊər oʊn ɡreɪv/
UK /dɪɡ jʊər oʊn ɡreɪv/
"dig your own grave" picture
1.

自分の墓穴を掘る, 自滅する

to do something that will cause you problems or failure in the future

:
If you keep lying to your boss, you're just going to dig your own grave.
上司に嘘をつき続けると、ただ自分の墓穴を掘るだけだ。
By refusing to compromise, the politician was digging his own grave with the voters.
妥協を拒否することで、その政治家は有権者との間で自分の墓穴を掘っていた