WordNet (r) 3.0 (2006):

lead on
    v 1: entice or induce especially when unwise or mistaken
    2: be false to; be dishonest with [syn: deceive, lead on,
       delude, cozen]

Moby Thesaurus II by Grady Ward, 1.0:

74 Moby Thesaurus words for "lead on":
   act on, allure, approach, bait, bait the hook, be responsible for,
   bear upon, blandish, cajole, call the signals, captain, carry on,
   coax, command, conduct, control, coquet, dally, decoy, direct,
   draw, draw in, draw on, engineer, ensnare, entice, entrap,
   exert influence, flirt, flirt with, fool, get cozy with,
   give the come-on, govern, handle, head, head up, inveigle, lead,
   lobby, lobby through, lure, magnetize, make advances,
   make overtures, make the rules, make up to, manage, maneuver,
   manipulate, mastermind, offer bait to, officer, order, prescribe,
   pull strings, pull the strings, quarterback, regulate, rope in,
   run, seduce, skipper, string along, suck in, take command,
   take the lead, tempt, toll, toy, wanton, wire-pull, woo, work on