Meaning of “build-up” in the English Dictionary

"build-up" in British English

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build-upnoun [ C usually singular ]

uk /ˈbɪld.ʌp/ us /ˈbɪld.ʌp/

(Definition of “build-up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"build-up" in Business English

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build-upnoun [ C or U ]

uk /ˈbɪldʌp/ us

an increase in the amount of something over a period of time:

Environmentalists are urging industries to go green in order to reduce further build-up of CO2 emissions.

(Definition of “build-up” from the Cambridge Business English Dictionary © Cambridge University Press)