reassure UK /ˌɹi.əˈʃʊə(ɹ)/US /ˌɹi.əˈʃʊɹ/ verb2 •To assure anew; to restore confidence to; to free from fear or self-doubt.The boy's mother reassured him that there was no monster hiding under the bed. •To reinsure. formsreassured · reassuring · reassures · reassureth · reassurest