Verb
cause to overturn from an upright or normal position
Source: WordNetYou have a row of dominoes set up; you knock over the first one, and what will happen to the last one is that it will go over very quickly. Dwight D. Eisenhower
At Pottery Barn, if you knock over a lamp, you have to glue it back together, even if when you're done it looks terrible and it doesn't work. Oh, and you have to stay in the store forever. Oh, and it's an exploding lamp. Stephen Colbert
The cat knocked over the flower vase Source: Internet
the clumsy customer turned over the vase Source: Internet
he tumped over his beer Source: Internet
"It just takes a single person to knock over a domino." Source: Internet