in charge of
in charge of {prep.}
1. Responsible for; having supervision or care of.
Marian is in charge of selling tickets.
The girl in charge of refreshments forgot to order the ice cream for the party.
When our class had a play, the teacher put Harold in charge of the stage curtain.
2. or in the charge of
Under the care or supervision of.
Mother puts the baby in the charge of the baby-sitter while she is out.
The money was given in charge of Mr. Jackson for safekeeping.
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Source: A Dictionary of American Idioms