go out like a light
US /ɡoʊ aʊt laɪk ə laɪt/
UK /ɡoʊ aʊt laɪk ə laɪt/

1.
很快睡着, 倒头就睡
to fall asleep very quickly or suddenly
:
•
After working all day, he went out like a light as soon as his head hit the pillow.
工作了一整天后,他一沾枕头就睡着了。
•
The baby was so tired that she went out like a light during her feeding.
宝宝太累了,喂奶的时候就睡着了。
2.
立刻昏过去, 突然失去知觉
to lose consciousness suddenly
:
•
The boxer took a heavy punch and went out like a light.
拳击手挨了一记重拳,立刻昏了过去。
•
The sudden drop in blood pressure made her go out like a light.
血压突然下降让她立刻昏了过去。