Emily Dickinson Lexicon

FALS'I-FY, v.t. [Fr. falsifier, from false.]

1. To counterfeit; to forge; to make something false, or in imitation of that which is true; as, to falsify coin. The Irish bards use to falsify every thing. Spenser.
2. To disprove; to prove to be false; as, to falsify a record.
3. To violate; to break by falsehood; as, to falsify one's faith or word. Sidney.
4. To show to be unsound, insufficient, or not proof. [Not in use.] His ample shield is falsified. Dryden.