feel blue
have the blues

Sometimes it's very hard to bear, but I shouldn't feel blue.

When a fellow feels so blue, what can he do?

It's all because of you, I'm feeling sad and blue.

He felt blue and did not know the source of it.

When their hormone levels went back to normal, these women felt blue.

They have more than enough reasons to feel blue.

"It always ends up making you feel blue as hell."

Family therapy may be particularly important for teens who feel blue.

Sometimes, feeling blue, he would knock on a friend's door after clearly having had too much to drink.

I think the pictures look great, cause clearly Intel is feeling blue.