0 an official piece of paper, etc. that gives a student permission to leave their classroom during a class:
The teacher, the youth said, had declined 20 minutes of repeated requests for a hall pass to use the toilet.
When asked for a hall pass, he'd say: "I'm a teacher! What are you talking about?"
"I feel like Mr. Milsap gave me a hall pass to do whatever I want to do," he said.
In the film Rick and Fred's wives give them a week off marriage - or a "hall pass" - to indulge their carnal desires.
