WordNet (r) 3.0 (2006):

branch out
    v 1: vary in order to spread risk or to expand; "The company
         diversified" [syn: diversify, branch out, broaden]
         [ant: narrow, narrow down, specialise, specialize]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "branch out":
   bestrew, bifurcate, branch, broadcast, circumfuse, deal out,
   deploy, diffract, diffuse, dispense, disperse, dispread,
   disseminate, distribute, divaricate, diverge, expand, extend, fan,
   fan out, flare, fork, furcate, issue, open, open up, outspread,
   outstretch, overgrow, overrun, overscatter, oversow, overspread,
   propagate, publish, radiate, ramify, retail, scatter, sow,
   sow broadcast, splay, spraddle, sprangle, sprawl, spread,
   spread like wildfire, spread out, stem, strew, trifurcate, unfold,
   utter, widen