set (one's) mind at rest(redirected from set their minds at rest)
set (one's) mind at rest
To assuage or relieve 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 set your mind at rest: he's going to make a full recovery. I'm trying to set my mind at rest about these debts, but I just can't get it out of my head.
set one's mind at rest
Also, put one's mind at rest. Stop worrying, allay one's anxiety. For example, Your car's been found undamaged, so set your mind at rest. Also see lay at rest.