Etymology
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clamour

chiefly British English spelling of clamor (q.v.); for spelling, see -or. Related: Clamoured; clamouring; clamourous.

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Definitions of clamour
1
clamour (v.)
utter or proclaim insistently and noisily;
Synonyms: clamor
clamour (v.)
make loud demands;
Synonyms: clamor
2
clamour (n.)
loud and persistent outcry from many people;
Synonyms: clamor / clamoring / clamouring / hue and cry
From wordnet.princeton.edu