Source : Webster's Revised Unabridged Dictionary (1913)

Tergiversate \Ter"gi*ver*sate\, v. i. [L. tergiversatus, p. p.
   of tergiversari to turn one's back, to shift; tergum back +
   versare, freq. of vertere to turn. See {Verse}.]
   To shift; to practice evasion; to use subterfuges; to
   shuffle. [R.] --Bailey.

Source : WordNet®

tergiversate
     v 1: be deliberately ambiguous or unclear in order to mislead or
          withhold information [syn: {beat around the bush}, {equivocate},
           {prevaricate}, {palter}]
     2: abandon one's beliefs or allegiances [syn: {apostatize}, {apostatise}]