topple

Short definition from Wiktionary

Verb

1. 1
   To push or throw over.
2. 2
   To overturn.
3. 3
   To overthrow something.
4. 4
   To totter and fall, or to lean as if about to do so.

Noun

1. 1
   A fall (an instance of falling over).
2. 2
   A cascade of dominoes falling, such that each fall causes the next domino to topple.