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English definition of “red”

red

adjective uk   /red/ (redder, reddest) us  
A1 of the colour of fresh blood: red lipstick The dress was bright red. A2 describes hair that is an orange-brown colour go/turn (bright) red B2 If you go/turn red, your face becomes red because you are angry or embarrassed: Look, you've embarrassed him - he's gone bright red! If your eyes are red, the white part of your eyes and the skin around your eyes is red, because of crying, tiredness, too much alcohol, etc.
redness
noun [U] uk   /ˈred.nəs/ us  
Her scar healed, but the redness remained for a long time.

red

(Definition of red adjective, noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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