Knock over Definition 1 of 4Pro Tip 1/3Physical Action Often implies an accident or carelessness, not always intentional. She accidentally knocked over the vase while dancing. Pro Tip 2/3Visual Imagery Creates a mental picture of something tipping and falling. The toddler knocked over his milk cup. Pro Tip 3/3Result of Force Indicates the result of some force applied, whether by a person or nature. A strong gust of wind knocked over the tree.