I need to go to the toilet. Could you let me off the hook?
我需要去卫生间。你能让我脱身吗？
I haven't studied much but my teacher let me off the hook today.
我还没有学太多，但我老师今天放了我一马。
It can also mean to release someone from a difficult situation. I do need you to let me off the hook.
它也能指把某人从困境中解放出来。我确实需要你让我脱离困境。
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