What does "blue" mean?
Native speaker’s answer
Rebecca
"Blue" means feeling sad, unhappy, or upset. Many idioms can express that you are feeling sad. Similar expressions to "feel blue" are "down in the dumps," "feeling down," "cry one's eyes out," "broken-hearted," "a heavy heart," "under a rain cloud," and "glum." Ex: She is feeling a little blue today. Ex: After my dad died, I felt blue for a long time. Ex: We felt very blue when it rained on our beach day.