British spelling of clamored; past tense of clamour, meaning to make loud demands or complaints.
British English spelling of 'clamored,' using the '-our-' spelling pattern typical of British orthography. From Latin 'clamor' via Old French, with the -ed past tense marker.
The British spelling 'clamoured' with its extra 'u' is one of many transatlantic spelling differences—American writers dropped the 'u' from words like 'color' and 'clamor' as a deliberate spelling reform in the 1800s.
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