Usage Note
Custodiar implies an ongoing duty of protection or custody, used for guarding prisoners, valuables, or documents. The noun custodia covers custody of a child (custodia compartida, joint custody) and the guarding of an object. It is more formal than vigilar and implies legal or official responsibility.
Examples
"Los agentes custodian el edificio las veinticuatro horas."
Natural Translation
Officers guard the building twenty-four hours a day.

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