Synonyms to settle the matter

ascertain, afford proof of, appraise, ask, assure, be informed, become acquainted with, bring home to, broaden the mind, catch on, certify, cinch, clear up, clinch, consider, contemplate, cram the mind, decide, demonstrate, determine, discover, dismiss all doubt, ensure, establish, find, find out, find out about, fix, follow, follow from, gain knowledge, get, get at, get hold of, have a case, hear, hold good, hold water, inquire, inspect, insure, interrogate, learn, learn about, load the mind, make a decision, make certain, make good, make no doubt, make no mistake, make out, make sure, make sure of, nail down, observe, pick up information, prove, prove to be, prove true, query, question, reassure, remove all doubt, resolve, see, see that, see to it, set at rest, settle, show, sort out, study, survey, tumble, unearth, view, weigh, account for, accredit with, accrete to, accuse of, acknowledge, anathematize, apply to, ascribe to, assign to, attach to, attaint, attribute to, be convincing, blacklist, blame, blame for, blame on, bring over,