knock someone out
phrasal verb with knock verb uk/nɒk/ us/nɑːk/
(MAKE UNCONSCIOUS)
B2 击昏（某人）;使（某人）不醒人事
to hit someone so that they become unconscious
His opponent knocked him out with one punch. 他的对手一拳就将他击昏了。
See also: knockout noun (UNCONSCIOUS)
(MAKE SLEEP)
（药物或酒精）使（某人）入睡
If a drug or alcohol knocks you out, it makes you go to sleep.
The sleeping tablets knocked him out for 18 hours. 安眠药使他睡了18个小时。
(DEFEAT)
B2 （在竞赛中）淘汰（某人或某队）
to defeat a person or a team in a competition so that they can no longer take part in it
The champion was unexpectedly knocked out (of the tournament) in the first round. 冠军在比赛的第一轮中被意外淘汰出局。
(IMPRESS)
old-fashioned slang给（某人）留下深刻印象;使（某人）钦佩
to cause enjoyment or admiration in someone
We were all really knocked out by the film. 我们对这部电影留下了深刻的印象。