go under
US /ɡoʊ ˈʌndər/
UK /ɡoʊ ˈʌndər/

1.
2.
失去知覺, 睡著
to become unconscious or fall asleep, especially due to an anesthetic or exhaustion
:
•
The patient began to go under as the anesthesia took effect.
隨著麻醉藥生效,病人開始失去知覺。
•
After a long day, he just wanted to go under and sleep.
漫長的一天過後,他只想睡著。