WordNet (r) 3.0 (2006):

buy off
    v 1: pay someone with influence in order to receive a favor
         [syn: buy off, pay off]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "buy off":
   approach, bribe, buy, buy back, buy in, buy into, buy on credit,
   buy up, complete a purchase, corner, corrupt, engross, fix, get at,
   get to, grease, grease the palm, have, lubricate, make a buy,
   monopolize, pay off, procure, purchase, reach, rebuy, regrate,
   repurchase, sop, square, suborn, take care of, tamper with,
   tickle the palm