Knockdown n. : A felling by a knock, as of a combatant, or of an animal.

Knockdown a. : Of force sufficient to fell or completely overthrow; as, a knockdown blow; a knockdown argument.

Example:
How do you do a Knockdown ceiling texture?

Taxonomy
Knockdown, Knockdown texture, Gene knockdown, free encyclopedia, song, Search, Wiktionary, knockout, Swoop, Terrorsaur, Nightscream, Complete knock down, the Transformers, Transformers universe, Transformers, free dictionary, Alesha Dixon, full-contact.

Defination from the web:
Knockdown, in full-contact combat sports, when a fighter is down or vulnerable, often preliminary to a knockout. Knockdown, a fictional character in the Transformers universe, partnered with Swoop, Terrorsaur, and Nightscream. Knockdown texture, a drywall finishing style ...