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English definition of “build (sth) up”

build (sth) up

phrasal verb with build     /bɪld/ verb (past tense and past participle built)
to increase or develop, or to make something increase or develop: This will help to build up his confidence. Traffic usually builds up in the late afternoon.Increasing and intensifying
(Definition of build (sth) up from the Cambridge Learner's Dictionary © Cambridge University Press)

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