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

1.
读唇语, 看口型
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.
音乐太吵了,我不得不读她的唇语才能明白她的话。
•
He couldn't hear me over the crowd, so I just pointed and hoped he would read my lips.
他在人群中听不到我的声音,所以我只是指了指,希望他能读懂我的唇语。