to shut / close the gate; to stop work for the day; to pull down the shutters [colloquial]

(to close the gate and unleash the dogs to ward off burglars); to express that a place is closed and visitors are not welcome; a phrase used for telling coworkers that it's time to lock up soon so that they should hurry and finish what they are doing; a phrase used to warn those who come asking for trouble to watch out and be careful of their actions; to pull down the shutters and finish for the day [colloquial]