ter·gi·ver·sate /ˈtɝʤəvɚ/
  (vi.)搪塞,推託,變節,背叛,自相矛盾
  Ter·gi·ver·sate v. i.  To shift; to practice evasion; to use subterfuges; to shuffle. [R.]
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  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]