Definition of “red” - Learner’s Dictionary

red

noun us uk /red/
Extra Examples
The blue, white and red of the French flag are symbolic of liberty, equality and fraternity.The colour red is used to denote passion or danger.She looks best in bright colours, like red and pink.He drew a heart and coloured it red.Her favourite colour is red.

A2 [ C, U ] the colour of blood

in the red

If your bank account is in the red, you have spent more money than there was in it.

See also

(Definition of “red noun” from the Cambridge Learner's Dictionary © Cambridge University Press)