She knew she had burned her boats when she declined the job offer.
Она знала, что сожгла за собой лодки, когда отказалась от предложения о работе.
Definitions
To 'burn (someone's) boats' means to commit to a course of action so completely that there is no way to turn back or retreat, often by eliminating any possibility of reversing a decision. The phrase originates from historical military tactics where commanders would burn their own ships to prevent retreat, forcing their troops to move forward.