subvert

Short definition from Wiktionary

Verb

1. 1
   To overturn from the foundation; to overthrow; to ruin utterly.
2. 2
   To pervert, as the mind, and turn it from the truth; to corrupt; to confound.
3. 3
   To upturn convention from the foundation by undermining it (literally, to turn from beneath).

Noun

1. 1
   An advertisement created by subvertising.