THESAURUS
circumstantiate
adduce, affirm, anatomize, atomize, attest, authenticate, back, back up, bear out, bolster, buttress, certify, cite, confirm, corroborate, descend to particulars, detail, document, enter into detail, fortify, give full particulars, instance, itemize, particularize, probate, prove, ratify, reinforce, specify, spell out, strengthen, substantiate, support, sustain, undergird, uphold, validate, verify, warrant