Knockdown or knock-down may refer to:Knockdown, a situation in full-contact combat sports where a fighter is down or vulnerable, often preliminary to a knockout Knockdown, a nautical term for a near-capsize Knockdown ', an arcade game released by Namco "Knockdown" (Castle), the thirteenth episode of the third season of the TV series Castle Knockdown, a fictional character in the G.I. Joe universe "Knockdown" (song), a song by Alesha Dixon Knockdown, Gloucestershire, a hamlet near Sherston, Wiltshire, United Kingdom Gene knockdown, a genetic modification technique knock-down fastener knock-down furniture Knock-down kit, a complete kit needed to assemble a vehicle Knockdown resistance, genetic resistance to pyrethroid insecticides in many insect species Knockdown texture, a drywall finishing style KnocDown, a music producer