B1 If a light or a machine goes off, it stops working.(电灯)熄灭;(机器)停止运行,停止运转
More examples
The damage to the fuse box caused the power to go off.
The light goes off when the batteries are flat.
The match had to be abandoned when the floodlights went off.
The electricity will be going off for ten minutes while the workmen test the circuit.
It's getting cold. The heater must have gone off.
C1 If a bomb goes off, it explodes.爆炸
C1 If a gun goes off, it fires.(枪)走火,开火
More examples
The firework went off in his face.
They could hear the sound of bombs going off in the background.
The explosives went off without warning.
We must clear the area before the bomb goes off.
Do not move until you hear the starting pistol go off.
B2 UK If food or drink goes off, it is not good to eat or drink any more because it is too old.(食物、饮料等)变质,变坏,腐败
More examples
Put the milk back in the fridge or else it will go off.
That meat looks like it's gone off.
Cream will go off very quickly if it is not kept in the fridge.
Preservatives are added to prevent food from going off so quickly.
Food that is not stored correctly goes off more quickly.
B2 If a warning device goes off, it starts to ring loudly or make a loud noise.(警报器等)突然发出巨响
More examples
They could hear the fireworks going off in the distance.
His car alarm is always going off by mistake.
I got a real shock when the fire alarm went off.
Take the chicken out of the oven when the timer goes off.
A buzzer goes off if the door has been left open.
B1 to leave a place and go somewhere else离开
to happen in a particular way发生;进展
UK to become worse in quality(质量)变劣,下降
See also: go off sb/sth
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