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

1.
tranquilizar a alguien, quitarle una preocupación a alguien
to tell someone something that makes them stop worrying
:
•
I called her to put her mind at rest about the children.
La llamé para tranquilizarla sobre los niños.
•
The doctor's explanation helped to put my mind at rest.
La explicación del médico ayudó a tranquilizarme.