noun
lip reading
Refers to the technique or skill of understanding speech by watching lip movements. Often used in contexts of deaf communication or surveillance.
彼女は読唇術で会話の内容を理解した。
She understood the content of the conversation through lip reading.
Compound of 読 (doku, 'read'), 唇 (shin, 'lips'), and 術 (jutsu, 'technique').