come off
1. To acquit oneself; fare
2. Appear, seem
3. Succeed
4. Happen, occur
5. To have recently completed or recovered from
When something comes off, it becomes detached from what it was attached or fastened to.
When an event comes off, it is successful.
When you say "Come off it" to people, you are saying that you think something they have said is untrue or foolish.
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