go down on

US /ɡoʊ daʊn ɑn/
UK /ɡoʊ daʊn ɑn/
"go down on" picture
1.

口交

to perform oral sex on someone

:
He asked her to go down on him.
他讓她給他口交
They decided to go down on each other.
他們決定互相口交