Today’s idiom: burning your bridges
Meaning: cutting off your option to go back; ending an interaction, whether personal or professional, in such a way that it cuts off all ties with the person(s) or business
Origin: It’s unclear when this phrase came into play. All the sources agree that it came from a military strategy in which the commander would burn bridges as his army advanced to keep the enemy from following and keep his troops moving forward. Maybe not the best strategy ever?