The Collaborative International Dictionary of English v.0.48:

bankroll \bankroll\ n.
   1. the money carried on one's person. "He shot his bankroll
      on a bob-tailed nag."

   Syn: roll, wad.
        [WordNet 1.5 +PJC]

   2. one's total supply of money; funds.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

bankroll \bankroll\ v. t.
   To pay the costs of; as, Who will bankroll the restoration of
   the former East German economy?.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

bankroll
    n 1: a roll of currency notes (often taken as the resources of a
         person or business etc.); "he shot his roll on a bob-tailed
         nag" [syn: bankroll, roll]
    v 1: provide with sufficient funds; finance; "Who will bankroll
         the restoration of the former East German economy?"

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "bankroll":
   angel, back, capitalize, finance, fund, grubstake, patronize,
   pay for, provide for, refinance, roll, set up, shoestring, sponsor,
   stake, subsidize, support, wad