read someone's lips
US /riːd ˈsʌm.wʌnz lɪps/
UK /riːd ˈsʌm.wʌnz lɪps/

1.
lippen lezen, van de lippen aflezen
to understand what someone is saying by watching the movements of their lips, without hearing their voice
:
•
The music was so loud, I had to read her lips to understand her.
De muziek was zo luid, ik moest haar lippen lezen om haar te verstaan.
•
He couldn't hear me over the crowd, so I just pointed and hoped he would read my lips.
Hij kon me niet horen boven de menigte, dus ik wees gewoon en hoopte dat hij mijn lippen zou lezen.