Quadruple the score (6)

I believe the answer is:

eighty

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This clue could be a double definition.

'quadruple' is the first definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?

'score' is the second definition.
(I have seen 'Several score' mean 'eighty' so perhaps 'score' could also mean 'eighty')

'the' acts as a link.

Can you help me to learn more?

(Other definitions for eighty that I've seen before include "LXXX" , "'Nineteen -- Four' (novel)" , "XXC" , "Cardinal" , "Around the World in - Days (Verne)" .)

I've seen this clue in the Evening Standard.

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