go off
go off {v.}
1. To leave; to depart.
Helen's mother told her not to go off without telling her.
2a. To be fired; explode.
The firecracker went off and scared Jack's dog.
2b. To begin to ring or buzz.
The alarm clock went off at six o'clock and woke Father.
3. To happen.
The party went off without any trouble.
The parade went off without rain.
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Source: A Dictionary of American Idioms
