yesterdawn adverb 1noun 1forms 3 adverb1 •At dawn on yesterday.But, now I know you love the lass, I'll say I saw her yesterdawn as blooming as her name. — 1905 noun1 •The dawn of yesterday.They come to me from the years agone, Like echoes from far away :Like sunbeams that faded at yesterdawn, Like the glory of yesterday. — 1904 formsyesterdawns · more yesterdawn · most yesterdawn