Dictionary / Vocabulary / 物を言う
ものをいう
to speak (of something); to be effective; to be powerful; to be helpful
Also written ものを言う
彼女は率直にものを言う。
She's a plain speaker.
目は口ほどに物を言う。
The eyes are as eloquent as the tongue.
目が口よりものを言う時がある。
Eyes sometimes talk louder than words.