6.(destroy, damage, injure)to knock sth out or to knock out sth击败；摧毁；破坏掉
Our bombers have knocked out the mobile launchers.我们的轰炸机已摧毁了移动火箭发射台。
A storm has made roads treacherous and knocked out power.一场暴风雨致使公路隐患重重, 还造成了电力瘫痪。
7.<非正式>(amaze, impress)
8.(remove by tapping)to knock sth out or to knock out sth
+ pipe敲空
Billy sighed and knocked out his pipe.比利一边叹着气一边敲着烟斗。
9.to knock sth out of sb
+ fun, enthusiasm, fight使(某人)失去…
Most of the fight had been knocked out of her.她的斗志已经被消磨将尽。
Married life had knocked the fun out of him.婚后的生活让他了无兴致。