ascertaining

confirm determine divine double-check find out verify

check dig discover establish eye eyeball fix identify learn peg read see settle size tell

catch on check out check up on get down cold get down pat get hold of get it down get the hang of learn the ropes look-see make certain make sure pick up pick up on size up

disprove invalidate

aid assist confuse destroy help ignore look away miss misunderstand neglect overlook unsettle