[1] : WordNet (r) 2.0

work up
     v 1: form or accumulate steadily; "resistance to the manager's
          plan built up quickly"; "pressure is building up at the
          indian-pakistani border" syn: build up, build, progress
     2: develop; "we worked up an as of an appetite" syn: get up
     3: bolster or strengthen; "we worked up courage"; "build up
        confidence"; "ramp up security in the airports" syn: build
        up, build, ramp up
     4: come up with; "his colleagues worked out his interesting
        idea"; "we worked up an ad for our client" syn: work out
see also:
build up build progress get up build up ramp up 
work out 

[2] : Moby Thesaurus II by Grady Ward, 1.0

166 moby thesaurus words for "work up":
   pap test, aggravate, agitate, anatomic diagnosis, annoy, arouse,
   arrange, awake, awaken, beat, beat up, biological diagnosis,
   biopsy, blow the coals, blow up, breed, bristle, calculate,
   call forth, call up, cast, cause, chafe, churn, churn up,
   clinical diagnosis, concert, contrive, convulse, cut out,
   cytodiagnosis, design, devise, diagnosis, differential diagnosis,
   digital examination, disarrange, discompose, disquiet, disturb,
   electrocardiography, electroencephalography, electromyography,
   embitter, engender, enkindle, enrage, examination, exasperate,
   excite, fan, fan the fire, fan the flame, feed the fire, ferment,
   figure, fire, flame, flurry, foment, forecast, frame, frenzy, fret,
   get up, hatch, heat, heat up, huff, impassion, incense, incite,
   induce, inflame, infuriate, instigate, intend, irritate, key up,
   kindle, laboratory diagnosis, lather up, lay plans, light the fuse,
   light up, madden, make a projection, make arrangements,
   mammography, methodize, miff, move, muster up, nettle, occasion,
   oral examination, organize, overexcite, paddle, peeve, perturb,
   perturbate, physical diagnosis, physical examination, pique, plan,
   plan ahead, postmortem diagnosis, prearrange, produce, program,
   project, provoke, put up to, rally, rankle, rationalize, rile,
   ripple, roil, roughen, rouse, ruffle, rumple, schedule, schematize,
   serodiagnosis, set astir, set fire to, set on, set on fire, set up,
   shake, shake up, shape, sic on, smear, steam up, stir,
   stir the blood, stir the embers, stir the feelings, stir up, study,
   summon up, swirl, systematize, test, tickle, trouble, turn on,
   upset, urinalysis, uroscopy, vex, wake, wake up, waken, warm,
   warm the blood, whet, whip, whip up, whisk, work into, work out

Backed Up >> B Words
Backed Up, definition of term: Backed Up
backed+up_pag1.html

Ball Up >> B Words
Ball Up, definition of term: Ball Up
ball+up_pag1.html

Back Up >> B Words
Back Up, definition of term: Back Up
back+up_pag1.html

At Work >> A Words
At Work, definition of term: At Work
at+work_pag1.html

Ante Up >> A Words
Ante Up, definition of term: Ante Up
ante+up_pag1.html

Act Up >> A Words
Act Up, definition of term: Act Up
act+up_pag1.html