Английский словарь американских идиом - burn one's bridges

also 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./