knocked out (Adjective) — Knocked unconscious by a heavy blow.
knocked out (Adjective) — Damaged. ex. "the gym has some of the most knocked-out equipment since Vic Tanny"
knocked out (Verb) — Eliminate. ex. "knock out a target"
knocked out (Verb) — Knock unconscious or senseless. ex. "the boxing champion knocked out his opponent in a few seconds"
knocked out (Verb) — Destroy or break forcefully. ex. "The windows were knocked out"
knocked out (Verb) — Overwhelm with admiration. ex. "All the guys were knocked out by her charm"
knocked out (Verb) — Empty (as of tobacco) by knocking out. ex. "knocked out a pipe"