lay at rest
Also, lay to rest; set at rest. Satisfy, settle, as in I'll take care of it; you can set your mind at rest, or The arbitrator is sure to lay these questions to rest. [Late 1300s] Also see at rest; lay to rest.
Lay vs. LieThe difference between the verbs lay and lie is one of English’s thornier cases of confusion. Both words involve something or someone in a horizontal position, but where the two words deviate has to do with who or what is horizontal—the subject of the verb (the one doing the action) or the direct object (the person or thing being acted upon). When to use lay …
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.