blue rinse noun 1blue-rinse verb 1forms 4 noun1 •A diluted blue hair dye used to reduce the yellowed or translucent appearance of greying hair on older women (because the ability to see the color blue decreases with age). blue-rinse verb1 •To treat or dye hair with a blue rinse. formsblue-rinsed · blue-rinsing · blue-rinses · blue rinses