arrest² n [C,U] when a police officer takes someone away and guards them because they may have done something illegal 逮捕，拘留: make an arrest The police expect to make an arrest soon. 警方希望尽快逮捕（罪犯）。 be under arrest (=have just been arrested) 被捕: Don't move, you're under arrest! 不许动，你被捕了！