KO or k.o.

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

To knock out

A knockout

• buffer zone
• buffer zones
• buffet
• buffet car
• buffet cars
• buffeted
• buffeting
• buffetings
• buffets
• buffi
• buffing
• buffings
• buffing-wheel
• buffing-wheels
• buff-jerkin
• buff-leather
• bufflehead
• buffleheads
• buffo
• buffoon
• buffooneries
• buffoonery
• buffoons
• buffs
• buff-stick