1 [uncountable and countable]CC
the colour of blood:
I like the way the artist uses red in this painting.
the reds and yellows of the trees
The corrections were marked in red (=in red ink).
2 [uncountable and countable]DFD
red wine [↪ white]:
a nice bottle of red
to owe more money than you have [≠ be in the black; ↪ overdrawn]:
This is the airline's fourth straight year in the red.
4 [countable] informalPPG
someone who has communist or very left-wing political opinions - used especially in the past to show disapproval