blue

noun1 of 2

color of the clear sky

• “The blue screen of death popped up on the screen.”Tatoeba
• “When the cold days arrived, I was overcome by blues.”Tatoeba

Sentences from Tatoeba show real usage. A word can have several meanings, so a sentence may use another one.

verb2 of 2

To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.