take somebody's word for it
take (one's) word for it
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 for it. He has no reason to lie to us.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
take somebody’s ˈword for itbelieve something that somebody has said: You know more about cars than I do, so if you think it needs a new gearbox, I’ll take your word for it. ♢ Can I take your word for it that the text has all been checked?
Farlex Partner Idioms Dictionary © Farlex 2017