Meaning of “red” - Learner’s Dictionary

red

adjective us uk /red/ redder, reddest
Extra Examples
The red light means stop.She picked out a red shirt for me to try on.He gave me a bunch of red roses.The bar was decked out with red and yellow flags.Florian was wearing a jacket with a red shirt underneath.
COLOUR

A1 being the same colour as blood:

a red shirt
HAIR

A2 Red hair is an orange-brown colour:

Rosie's got red hair and freckles.
go red UK US turn red

B2 If someone goes red, their face becomes red because they are embarrassed or angry:

He kissed her on the cheek and she went bright red.
WINE

A2 Red wine is made from black grapes (= small, round, purple fruits).

→ See also be like a red rag to a bull

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