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English definition of “rack sth up”

rack sth up

phrasal verb with rack
 
 
/ræk/ verb [T]
to gradually gain a large amount of something: The government and debt counsellors believe it is too easy to rack up large numbers of loans. The company's dozen vehicles rack up 144,000 miles a year. He'll rack up $10,000 in bonus money.rack sth up into sth Try to rack these small returns up into modest but consistently positive returns.
(Definition of rack sth up from the Cambridge Business English Dictionary © Cambridge University Press)
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