- DictionaryBlue/blo͞o/
adjective
- 1. of a color intermediate between green and violet, as of the sky or sea on a sunny day: "the clear blue sky"
- 2. (of a person or mood) melancholy, sad, or depressed: informal "he's feeling blue"
noun
- 1. blue color or pigment: "she was dressed in blue"
- 2. a small butterfly, the male of which is predominantly blue while the female is typically brown.
verb
- 1. make or become blue: "the light dims, bluing the retina"
- 2. wash (white clothes) with bluing: historical "they blued the shirts and starched the uniforms"