let someone off—excuse a person; not punish severely enough:
- “Are you going to let him off?” demanded Denny suspiciously. “You never can be stiff in the back, Charley.”
let someone off the hook —(also: get someone off the hook) free a person from difficulty, an embarrassing situation, etc.:
- The officer was pretty surprised at my tenacity, and it motivated him to let me off the hook.