WordNet (r) 3.0 (2006):

grow up
    v 1: become an adult

Moby Thesaurus II by Grady Ward, 1.0:

84 Moby Thesaurus words for "grow up":
   age, arise, ascend, attain majority, bear fruit, bloom, blossom,
   blow, brew, bring to maturity, burgeon, come of age,
   come to fruition, come to maturity, come up, curl upwards, develop,
   fledge, flourish, flower, gather, germinate, go up, grow,
   hypertrophy, increase, leave the nest, levitate, loom, maturate,
   mature, mellow, mount, mushroom, outgrow, overdevelop, overgrow,
   overtop, procreate, pullulate, reach its season, reach manhood,
   reach maturity, reach twenty-one, reach voting age, rear, rear up,
   reproduce, ripe, ripen, rise, rise up, season, settle down,
   shoot up, spiral, spire, spring up, sprout, sprout up, stand up,
   surge, swarm up, sweep up, temper, thrive, toga virilis, tower, up,
   upgo, upgrow, upheave, uprise, upshoot, upspear, upspin, upspring,
   upsprout, upstream, upsurge, upswarm, upwind, vegetate, wax