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

1.
tranquilizar, deixar alguém mais calmo
to tell someone something that makes them stop worrying
:
•
I called her to put her mind at rest about the children.
Liguei para ela para tranquilizá-la sobre as crianças.
•
The doctor's explanation helped to put my mind at rest.
A explicação do médico ajudou a me tranquilizar.