[1] : WordNet (r) 2.0

size up
     v : to look at critically or searchingly, or in minute detail;
         "he scrutinized his likeness in the mirror" syn: take
         stock, scrutinize, scrutinise
see also:
take stock scrutinize scrutinise 

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

79 moby thesaurus words for "size up":
   appraise, appreciate, assay, assess, autopsy, calculate, calibrate,
   caliper, canvass, check, check a parameter, check out, check over,
   check up on, compute, contemplate, dial, divide, estimate,
   evaluate, examine, eye, fathom, gauge, give an examination,
   give the eye, give the once-over, go over, graduate, hard look,
   inspect, leer, leer at, look at, look over, measure, mensurate,
   mete, meter, monitor, observe, ogle, ogle at, overhaul, overlook,
   pace, pass over, pass under review, peer at, peruse, plumb, pore,
   pore over, postmortem, prize, probe, quantify, quantize, rate,
   review, run over, scan, scrutinize, set an examination, size,
   sound, span, step, study, survey, take a long, take a reading,
   take stock of, take the measure, triangulate, valuate, value, vet,
   weigh

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

Back Up >> B Words
Back Up, definition of term: Back Up
back+up_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