The process of gradually accumulating or increasing something; or an excessive accumulation of something in one place.
'Build' comes from Old English 'byldan,' and 'up' is from Old English 'upp.' Combined, 'buildup' became a noun in the 1800s to describe gradual accumulation or increase.
You hear 'buildup' in chemistry (plaque buildup on teeth), psychology (anxiety buildup), and even movies (the buildup to the climax)—it's this perfect word for describing tension or accumulation across completely different contexts.
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