Definition
to be in custody: to be detained, to be stopped and held (in prison etc.) 
            
            
to keep someone in custody: to retain someone, to stop someone from leaving (prison, etc.) 
            
            
custody: detention, being kept under guard (especially by the police) 
            
            
- "Our legal team is negotiating her release from custody."
- "We're going to keep Mr. Gidyeon in custody, mmkay?"
- "We're going to keep Mr. Gidyeon in custody."
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