To make false or deceptive; cause to vary from truth or genuineness; change so as to deceive; sophisticate; adulterate; misrepresent: as, to falsify accounts, weights and measures, or commodities; to falsify a person's meaning.To make a false representation of; counterfeit; forge.To show to be erroneous or incorrect; disprove: as, the event falsified his words.To violate; break by falsehood or treachery: as, to falsify one's faith or word.To cause to fail or become false; baffle; make useless: as, to falsify a person's aim.To feign, as a blow. Same as false, v. t., 5.In law: To prove to be false, as a judgment; avoid or defeat.In equity, to show to be erroneous, as an item claimed on the credit side of an account.To tell falsehoods; lie; violate the truth.n. In fencing, a feint; a baffling thrust.