WordNet (r) 3.0 (2006):

suck in
    v 1: take up as if with a sponge [syn: take in, sop up,
         suck in, take up]
    2: attract by using an inexorable force, inducement, etc.; "The
       current boom in the economy sucked many workers in from
       abroad" [syn: suck, suck in]
    3: draw in as if by suction; "suck in your cheeks and stomach"
       [syn: suck in, draw in]

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "suck in":
   absorb, allure, aspirate, bait, bait the hook, beguile, betray,
   bib, bitch, blandish, booze, breathe in, bunk, cajole, catch up in,
   coax, concern, decoy, delude, double-cross, drain the cup, draw,
   draw in, draw on, drink, drink in, drink off, drink to, drink up,
   embarrass, engage, enmesh, ensnare, entangle, entice, flirt,
   flirt with, four-flush, give the come-on, guzzle, imbibe,
   implicate, inhale, inspire, interest, inveigle, involve, lead on,
   lure, offer bait to, pledge, pull, quaff, rope in, seduce,
   sell out, sip, slurp, sniff, sniffle, snuff, snuff in, snuffle,
   suck, suck into, suckle, sup, swig, swill, take in, tangle, tipple,
   toast, toss down, toss off, wash down, woo