blue

One of the colors people can see

Example: The sky was a deep blue above her and golden yellow beyond the village.

Colored blue.

Example: He had blue eyes.

If you are blue, you are sad.

Example: He was very blue that day.

If a time is blue, it is a sad time.

Example: It was a blue day at school when he failed the test.

If a film, story or joke is blue, it has sexual or pornographic content.