擊倒;撞倒;擊落;使屈服;拆除;拆卸;迫使降低;獲得
knock down v 1: cause to come or go down; "The policeman downed the heavily armed suspect"; "The mugger knocked down the old lady after she refused to hand over her wallet" [syn: {down}, {cut down}, {push down}, {pull down}] 2: knock down with force; "He decked his opponent" [syn: {deck}, {coldcock}, {dump}, {floor}]