buildup

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build·up / ˈbildˌəp/ • n. [usu. in sing.] 1. a gradual accumulation or increase, typically of something negative and typically leading to a problem or crisis: the buildup of carbon dioxide in the atmosphere.2. a period of excitement and preparation in advance of a significant event: the buildup to Christmas. ∎  a favorable description in advance; publicity: a showbiz buildup before the album release.

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