Knock-down is a term used to describe something that has been demolished or brought down, either physically or metaphorically. Some synonyms for knock-down include demolish, destroy, flatten, level, dismantle, topple, overthrow, ruin, wreck, and annihilate. These synonyms can be used interchangeably to express the act of knocking something down, whether it be a building or a person's self-esteem. The word knock-down can also be used to describe a sale or bargain with greatly reduced prices, in which case synonyms may include slashed, discounted, bargain, reduced, or clearance. Overall, the word knock-down has a variety of synonyms that can be used depending on the context in which it is being used.