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

1.
rassurer, apaiser l'esprit de quelqu'un
to tell someone something that makes them stop worrying
:
•
I called her to put her mind at rest about the children.
Je l'ai appelée pour la rassurer au sujet des enfants.
•
The doctor's explanation helped to put my mind at rest.
L'explication du médecin a contribué à me rassurer.