blue · adjective /bluː/
blue (COLOUR)
A1 being the same colour as the sky when there are no clouds
Dictionary examples:
a dark/light/pale blue jacket
She has big blue eyes.
Learner example:
I like her long brown hair and blue eyes. (Skills for Life (Entry 1); A1; Albanian)
blue (SAD)
C2 sad
Dictionary example:
I was feeling blue.
Learner example:
Do you feel the need to dress, behave and consume the same products as your friends? Are you the kind of person who go[es] shopping when you feel blue or a little morose? (Certificate of Proficiency in English; C2; Portuguese)
blue · noun C or U /bluː/
blue
A2 a blue colour
Dictionary example:
There's a lot of blue in this room.
Learner example:
I want my bedroom to be painted in yellow and blue. (Key English Test; A2; Hindi)
out of the blue
C1 If something happens out of the blue, it is completely unexpected.
Dictionary example:
One day, out of the blue, she announced that she was leaving.
Learner example:
Dear Kim, I was extremely happy when I received your letter out of the blue. (Certificate in Advanced English; C1; Greek)
