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3. under arrest

under arrest

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*under arrest

arrested and in the custody of the police in preparation for the filing of a charge. (*Typically: be ~; put someone ~.) Stop where you are! You are under arrest! Am I under arrest, officer? What did I do?

under arrest

held by police in connection with a crime Police claim they have one of the gunmen under arrest.

under arrest

In police custody, as in They put him under arrest and charged him with stealing a car. [Late 1300s]