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

1.
安心させる, 心配を取り除く
to tell someone something that makes them stop worrying
:
•
I called her to put her mind at rest about the children.
子供たちのことで彼女を安心させるために電話した。
•
The doctor's explanation helped to put my mind at rest.
医師の説明で私は安心した。