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English definition of “rack sth up”

rack sth up

verb [T often passive] uk phrasal verb with rack   /ræk/ us  
mainly US informal to gradually get more points, profits, etc.: He has racked up 450 points in three months. Astronomical profits/losses were racked up by airlines last year.
Synonym
to increase something such as a rent or price, especially by an amount that is considered to be too much: Our landlord racked up the rent by 15 percent this year.
(Definition of rack sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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