From Longman Dictionary of Contemporary Englishput/set somebody’s mind at restput/set somebody’s mind at restWORRIEDto make someone feel less anxious or worried Why don’t you talk to him, and put his mind at rest. → rest
Examples from the Corpus
put/set somebody’s mind at rest• But she'd like to see him, to try and set her mind at rest.• I wish I could put their minds at rest.• It puts my mind at rest.• But let me set your mind at rest.• He must set their minds at rest about the Freddie affair, because they knew of Freddie.• He's been very kind to me and Lily, as regards putting our minds at rest about Stella.• He's unlikely to know how you feel, and until he does, he can't put your mind at rest.• Quite often, all that is required is a friendly chat to put your mind at rest. 