Definitions

1. adjective

having the color of the clear sky or the deepest part of the ocean

“The blue bird sang its sweet melody from the tree.”

2. noun

a colour intermediate between green and violet in the visible spectrum

“The blue pigment was added to the paint to give it a deeper hue.”

3. verb

to become or make something blue in colour

“The sky will blue as the sun rises.”

4. interjection

expressing sadness or melancholy

“Oh blue, why did you have to leave me?”