What is Falsify?

Legal Definition
To disprove; to prove to be false or-erroneous; to avoid or defeat; spoken of verdicts, appeals, etc. To counterfeit or forge; to make something false; to give a false appcaiance to anything. In equity practice. To show, in accounting before a master in chancery, that a charge has been inserted which is wrong; that is, either wholly false or in some part erroneous. Pull. Accts. 162; 1 Story, Eq. Jur. ยง 525. See Falsification.
-- Black's Law Dictionary
Legal Definition
To alter a document or record fraudulently; to disprove an account item. See 114 Pa. 82, 60 Am. Rep. 341, 7 Atl. 224.
-- Ballentine's Law Dictionary