go off — Phrasal Verb with go
/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.