give somebody their marching orders
give (one) (one's) marching orders
To dismiss one from employment; to order one to leave or move on from a place. An allusion to a military command of deployment. After messing up that account, I'm terrified that my boss is going to give me my marching orders. Bill had been living in his parents' house for nearly a year without working when they finally gave him his marching orders out of there.