burn\ one's\ boats

burn\ one's\ boats
• burn one's bridges
• burn one's boats
v. phr.
To make a decision that you cannot change; remove or destroy all the ways you can get back out of a place you have got into on purpose; leave yourself no way to escape a position.

Bob was a good wrestler but a poor boxer. He burned his boats by letting Mickey choose how they would fight.

When Dorothy became a nun, she burned her bridges behind her.

Словарь американских идиом. — СПб., Изд-во "Лань". . 1997.