knock-downBrE /ˈnɒk daʊn/ 🔊NAmE /ˈnɑːk daʊn/ 🔊 adjective [only before noun] (informal) (of prices, etc. 价格等) much lower than usual 低廉的 SYN rock-bottom using a lot of force 强有力的；用力的◆a knock-down punch强有力的一拳 knock-downBrE /ˈnɒk daʊn/ 🔊NAmE /ˈnɑːk daʊn/ 🔊 noun(in boxing 拳击运动) an act of falling to the ground after being hit 击倒(in football (soccer) 足球) an act of hitting a high ball down to the ground or to another player 将高球顶到地上或传给另一球员