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a short way of saying "knocked out and on the floor"
your doomed!!!! i gots a knockdown on you!!!!
by Spaz De Kat January 14, 2009
To have sex with a female so well that you can brag about it.

Intercourse without feelings.
I'm bout to go knock down this chick I met last night.
by Peko April 13, 2006
Knock-down is a British synonym for Knock-off
Don´t worry, that´s a knock-down (watch)
by abfdteacher January 14, 2010