knock|out «NOK OWT», noun, adjective.
–n.
1. the act of knocking out: »
The boxer won the fight by a knockout.
2. the condition of being knocked out.
3. a blow that knocks out.
4. U.S. Slang. a very attractive person; overwhelming or striking thing.
–adj. Slang.
1. that knocks out; defeating or that can defeat by knocking out: »
a knockout blow.
2. that puts something out of operation or diminishes: »
knockout competition. The biggest knockout punch against highway accidents in the state's road history (Birmingham News).
3. outstanding; stunning; overwhelming: »
a knockout performance. ... a knock-out scent to spell tempestuous attraction (Punch).
Useful english dictionary. 2012.