take the words out of someone's mouth
Anticipate what someone is about to say; also, completely agree with someone. For example, When you mentioned her dislike of fish you took the words right out of my mouth, or You took the words out of my mouth when you said he was stupid. This idiom was first recorded in 1574.
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.