take the words out of one's mouth
take the words out of one's mouth {v. phr.}
To say what another is just going to say; to put another's thought into words.
"Let's go to the beach tomorrow." "You took the words right out of my mouth; I was thinking of that."
I was going to suggest a movie, but she took the words out of my mouth and said she would like to see one.
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Source: A Dictionary of American Idioms
