take someone's word
take (one's) word
To accept what one says without further verifying or investigating. You're right to be wary, but, in this case, I think we can take John's word. He has no reason to lie to us.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
take someone's word (for it)believe what someone says or writes without checking for yourself.
Farlex Partner Idioms Dictionary © Farlex 2017