WordNet (r) 3.0 (2006):

supinate
    v 1: turn (the hand or forearm) so that the back is downward or
         backward, or turn out (the leg)

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "supinate":
   blow down, blow over, bowl down, bowl over, bring down, bulldog,
   cast down, chop down, convert, couch, cut down, dash down, deck,
   down, drop, evert, fell, fetch down, floor, ground, hew down,
   introvert, intussuscept, invaginate, inverse, invert, knock down,
   lay level, lay low, lay out, level, lie down, mow down,
   precipitate, pronate, prone, prostrate, pull down, rase, raze,
   recline, resupinate, reverse, revolve, rotate, send headlong,
   spread-eagle, take down, throw, throw down, topple, transpose,
   trip, tumble, turn about, turn around, turn down, turn in,
   turn inside out, turn out, turn over, turn the scale,
   turn the tables, turn upside down, whack down