He heard the tribesmen whooping as they descended on the fort.
Advanced English Dictionary
noun, verb +noun a loud cry expressing joy, excitement, etc: whoops of delight / laughter +verb[V] to shout loudly because you are happy or excited Idioms: whoop it up (informal) 1 to enjoy yourself very much with a noisy group of people 2 (AmE) to make people excited or enthusiastic about sth
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