went off; gone off; going off; goes off
Definition of go off
1
: explode
2
: to burst forth or break out suddenly or noisily
3
: to go forth, out, or away : leave
4
: to undergo decline or deterioration
5
: to follow the expected or desired course : proceed
the party went off well
6
: to make a characteristic noise : sound
could hear the alarm going off
go off the deep end
1
: to enter recklessly on a course
2
: to become very much excited
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- Which of these words does not mean "nonsense"?

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Merriam-Webster unabridged
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Time Traveler for go off
The first known use of go off was in 1579
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