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

1.
2.
терять сознание, засыпать
to become unconscious or fall asleep, especially due to an anesthetic or exhaustion
:
•
The patient began to go under as the anesthesia took effect.
Пациент начал терять сознание, когда анестезия подействовала.
•
After a long day, he just wanted to go under and sleep.
После долгого дня он просто хотел уснуть.