set (one's) mind at rest

set (one's) mind at rest

To assuage or relieve one's 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. That bonus really set my mind at rest about these debts.
See also: mind, rest, set
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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.
See also: mind, rest, set
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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