take (one's) word for (something)

take (one's) word for (something)

To accept what one says without further verifying or investigating. You're right to be wary, but I think we can take John's word for what's going on. He has no reason to lie to us.
See also: take, word

take someone's word for something

 and take someone's word on something
to believe what someone says about something without seeking further information or proof. It's true! Take my word for it. I can't prove it. You will have to take my word on it.
See also: take, word

take (someone's) word for it

To believe what someone says without investigating further.
See also: take, word
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