blue · n
out of the blue
C1 If something happens out of the blue, it is completely unexpected.
Dictionary examples:
An old fried of mine from college called me out of the blue yesterday. (34.4)
blue
A2 a blue color
Dictionary examples:
I love blue so much, I named my dog 'Blue'. He's brown! (0.0)
My friend ate too many blueberries. Now his tongue is all blue! (0.0)
I love blue so much, I even eat blueberries for breakfast! (0.0)
There's a lot of blue in this room. (24.7)