take someone at his or her word(redirected from take someone's word for)
take (one) at (one's) word
To accept what one says without further verifying or investigating. Why some people take that pundit at his word is beyond me. He clearly has an ulterior motive. You're right to be wary, but, in this case, I think we can take John at his word. He's just trying to help.
take someone at his or her word
Also, take someone's word for. Accept what someone says on trust, as in Since he said he'd agree to any of my ideas, I'll take him at his word, or She said she wanted to help out and I took her word for it. This idiom appeared in Miles Coverdale's translation of the Bible: "He said ... he is my brother. And the men took him shortly at his word" (I Kings 22:33). It is still so used.