Webster's English Dictionary

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tamper

tam.per \'tam-p*r\ \-p(*-)rin\ \-p*r-*r\ vb or tam.per.ing [prob. fr. MF 
   temprer to temper, mix, meddle - more at TEMPER] 1: to carry on underhand 
   or improper negotiations (as by bribery)  2a: to interfere so as to weaken 
   or change for the worse  2b: to try foolish or dangerous experiments : 
   MEDDLE  : to alter for an improper purpose or in an improper way  - 
   tam.per.er n