estuate UK /ˈɛs.tjʊˌeɪ̯t/US /ˈɛs.t͡ʃuˌeɪ̯t/ verb1 •(no longer used) To swell up or rage; to be agitated.it is onely profitable to a stomacke that estuateth with heat — 1620 formsestuated · estuating · estuates