knock·down / ˈnäkˌdoun/ (also knock-down) • adj. 1. inf. (of a price) very low. 2. capable of knocking down or overwhelming someone or something: repeated knockdown blows. ∎ (of furniture) easily dismantled and reassembled.• n. Boxing an act of knocking an opponent down. ∎ (also knockdown pitch) Baseball a pitch aimed so close to the body that the batter must drop to the ground to avoid being hit: the catcher gave the sign for a knockdown pitch.