falsify

Short definition from Wiktionary

Verb

1. 1
   To alter so as to make false; especially when done with intent to deceive.
2. 2
   To misrepresent.
3. 3
   To counterfeit; to forge.
4. 4
   To prove to be false.
5. 5
   To show (an item of charge inserted in an account) to be wrong.
6. 6
   To baffle or escape.
7. 7
   To violate; to break by falsehood.