WordNet (r) 3.0 (2006):

lean on
    v 1: rest on for support; "you can lean on me if you get tired"
         [syn: lean on, rest on, lean against]

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "lean on":
   abut on, bank on, be based on, bear against, bear down on,
   bear down upon, bear hard upon, bear on, bestraddle, bestride,
   bet on, calculate on, count on, depend on, gamble on,
   high-pressure, lie on, perch, place reliance on, press, pressure,
   put pressure on, reckon on, rely on, rely upon, repose on, rest on,
   ride, sit on, squeeze, stand on, straddle, stride, swear by,
   trust to