Meaning of "go off" in Essential English Dictionary

go off

phrasal verb with go uk /ɡəʊ/ verb going, went, gone

B1 to leave a place and go somewhere else:

She went off with Laurie.

B1 If a light or machine goes off, it stops working:

The heating goes off at ten o’clock.

If a bomb or gun goes off, it explodes or fires.

If something that makes a noise goes off, it suddenly starts making a noise:

His car alarm goes off every time it rains.

UK If food goes off, it stops being good to eat because it is too old:

That milk has gone off.

(Definition of “go off” from the Cambridge Essential Dictionary © Cambridge University Press)