• IPA: /ˈfɒlsɪfaɪ/


  1. (transitive) To alter so as to make false; to make incorrect.
    to falsify a record or document
    • The Irish bards use to forge and falsify everything as they list, to please or displease any man.
  2. (transitive) To misrepresent.
  3. (transitive) To prove to be false.
    • c. 1597, William Shakespeare, “The First Part of Henry the Fourth, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, [Act I, scene ii]:
      By how much better than my word I am, / By so much shall I falsify men's hope.
    • 1730, Joseph Addison, The Evidences Of The Christian Religion
      Jews and Pagans united all their endeavors, under Julian the apostate, to baffle and falsify the prediction.
  4. (transitive) To counterfeit; to forge.
    to falsify coin
  5. (transitive, accounting) To show (an item of charge inserted in an account) to be wrong.
    • 1912, Peyton Boyle, The Federal Reporter: Cases Argued and Determined in the Circuit District Courts of the United States
      The chancery rules governing proceedings to surcharge and falsify accounts are applicable only where an account has been stated between the parties, or where something equivalent thereto has been done.
  6. (transitive, obsolete) To baffle or escape.
    • For disputants (as swordsmen use to fence / With blunted foyles) engage with blunted sense; / And as th' are wont to falsify a blow, / Use nothing else to pass upon a foe […]
  7. (transitive, obsolete) To violate; to break by falsehood.
    to falsify one's faith or word
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