put (one's) mind at rest(redirected from put their mind at rest)
put (one's) mind at rest
To reduce or remove someone's or one's own worry, anxiety, dread, fear, etc. I know you're anxious to hear how your father is doing after the surgery, so let me put your mind at rest: he's going to make a full recovery. I'm trying to put my mind at rest about these debts, but I just can't get it out of my head.