falsify in WordNet English dictionary

1. insert words into texts, often falsifying it thereby
   interpolate  alter  falsify 
   
2. tamper, with the purpose of deception
   "Fudge the figures"; "cook the books"; "falsify the data"
   fudge  manipulate  fake  falsify  cook  wangle  misrepresent 
   
3. make false by mutilation or addition; as of a message or story
   falsify  distort  garble  warp 
   
4. falsify knowingly
   "She falsified the records"
   falsify 
   
5. prove false
   "Falsify a claim"
   falsify