KO or k.o.

1. Kick-off
2. Knockout
3. Knock out

To knock out

A knockout

• chain gang
• chain gangs
• chain-gear
• chain-gearing
• chain grate
• chain grates
• chain harrow
• chain harrows
• chaining
• chainless
• chainlet
• chainlets
• chain letter
• chain letters
• chain lightning
• chain-link fence
• chain locker
• chain lockers
• chain mail
• chainman
• chainmen
• chain moulding
• chain of command
• chain of office
• chain pier