take the word out of one's mouth

Meaning: 思っていることを言う、完全に同意する

For Example:

‣ When you said that dress was expensive, you took the word out of my mouth.

あのワンピース高いってあんたが言った時、私も全くそうやって思ったわ。

‣ As Susan was about to make a suggestion, a co-worker suddenly got up and took the word out of her mouth before she had the chance to.

スーザンが提案をしようとしていた時、同僚が突然立ち上がって、彼女が何も言う前に彼女が提案しようとしていたことを言ってしまった。

Synonym:

to say what someone else was thinking

to completely agree