"falsify" in the verb sense
1. falsify, distort, garble, warp
make false by mutilation or addition as of a message or story
2. fudge, manipulate, fake, falsify, cook, wangle, misrepresent
tamper, with the purpose of deception
"Fudge the figures"
"cook the books"
"falsify the data"
"Falsify a claim"
"She falsified the records"
5. interpolate, alter, falsify
insert words into texts, often falsifying it thereby
Source: WordNet® (An amazing lexical database of English)
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