definition of
[knock out]

[1] #1 knock out v. eliminate; "knock out a target". wn

[2] #2 knock out v. knock unconscious or senseless; "the boxing champion knocked out his opponent in a few seconds". wn

[3] #3 knock out v. destroy or break forcefully; "The windows were knocked out". wn

[4] #4 knock out v. overwhelm with admiration; "All the guys were knocked out by her charm". wn

[5] #5 knock out v. empty (as of tobacco) by knocking out; "knocked out a pipe". wn