daymare UK /ˈdeɪˌmɛə/US /ˈdeɪˌmɛɚ/noun 1verb 1forms 3 noun1 •A vivid, unpleasant mental image, having the characteristics of a nightmare, during wakefulness.“Bobbie Nell, that bird just wants to get out of your house. He's trapped in a bird nightmare.” “You're all nightmares! And I'm about to be your nightmare and your daymare.” — 2020 verb1 •To have a daymare.There must be something better to spend my precious time daymaring. — 2003 formsdaymared · daymaring · daymares