British spelling variant of 'grueled'; exhausted or worn out from grueling exertion.
This is the British English spelling of 'grueled', where the single 'l' in American spelling becomes 'll' before adding '-ed'. Both derive from 'gruel' as a verb.
The American/British spelling difference here reveals how English split into regional variants after the printing press standardized two slightly different traditions—a perfect example of how language change is permanent once writing fixes it!
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