robin's-egg blue adjective 1noun 1forms 1 adjective1 •Of a greenish blue colour, like that of an American robin's egg.Associate Justice and Mrs. Owen J. Roberts arrived shortly before the performance started. Mrs. Roberts wore a robins’ egg blue chiffon frock. — 1942 noun1 •A greenish blue colour, like that of an American robin's egg. formsrobin's-egg blues
