WordNet (r) 3.0 (2006):

bowl over
    v 1: cause to overturn from an upright or normal position; "The
         cat knocked over the flower vase"; "the clumsy customer
         turned over the vase"; "he tumped over his beer" [syn:
         overturn, tip over, turn over, upset, knock over,
         bowl over, tump over]
    2: overcome with amazement; "This boggles the mind!" [syn:
       flabbergast, boggle, bowl over]

Moby Thesaurus II by Grady Ward, 1.0:

74 Moby Thesaurus words for "bowl over":
   amaze, astonish, astound, awe, awestrike, bedaze, bedazzle,
   bewilder, blow down, blow over, boggle, bowl down, bring down,
   bulldog, cast down, chop down, confound, cut down, dash down, daze,
   dazzle, deck, down, drop, dumbfound, dumbfounder, electrify, fell,
   fetch down, flabbergast, flatten, floor, frighten, ground,
   hew down, jar, jolt, knock down, knock over, lay level, lay low,
   lay out, level, mow down, overwhelm, paralyze, perplex, petrify,
   precipitate, prostrate, pull down, rase, raze, send headlong,
   shake, shock, spread-eagle, stagger, startle, strike dead,
   strike dumb, strike with wonder, stun, stupefy, supinate, surprise,
   take aback, take down, throw, throw down, topple, trip, tumble,
   whack down