The term 'knock down' can refer to a variety of activities, from physical actions such as felling, decking, running over, upending, upsetting, and toppling, to more abstract activities such as acquiring, making, earning, razing, flooring, leveling, debasing, defaming, demoting, haggling, laying low, introducing, and overthrowing. In the physical sense, knock down can mean to cause something to fall or collapse, while in the abstract sense it can mean to reduce in rank, status, or reputation.