Webster's English Dictionary

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falsify

fal.si.fy \'fo.l-s*-.fi-\ vb [ME falsifien, fr. MF falsifier, fr. ML 
   falsificare, fr. L Xfalsus 1: to prove or declare false  2: to make false : 
   as  2a: to make false by mutilation or addition {~ a will}  2b: to 
   represent falsely : MISREPRESENT  3: to prevent the fulfillment of  : to 
   tell lies : LIE