1.
to leave a place, especially in order to do sth :
She went off to get a drink.
2.
to be fired; to explode :
The gun went off by accident.
The bomb went off in a crowded street.
➡ note at explode
3.
if an alarm, etc. goes off , it makes a sudden loud noise
4.
if a light, the electricity, etc. goes off , it stops working :
Suddenly the lights went off.
The heating goes off at night.
OPP go on
5.
( BrE , informal ) to fall asleep :
Hasn't the baby gone off yet?
6.
( BrE ) if food or drink goes off , it becomes bad and not fit to eat or drink
7.
( BrE ) to get worse in quality :
Her books have gone off in recent years.
8.
to happen in a particular way :
The meeting went off well .