put someone's mind at rest
US /pʊt ˈsʌm.wʌnz maɪnd æt rɛst/
UK /pʊt ˈsʌm.wʌnz maɪnd æt rɛst/

1.
tranquillizzare, mettere a proprio agio
to tell someone something that makes them stop worrying
:
•
I called her to put her mind at rest about the children.
L'ho chiamata per tranquillizzarla riguardo ai bambini.
•
The doctor's explanation helped to put my mind at rest.
La spiegazione del medico ha contribuito a tranquillizzarmi.