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English definition of “pump sth up”

pump sth up

verb uk phrasal verb with pump   /pʌmp/ us  
to fill something with air using a pump: Have you pumped up the balloons yet? I must pump the tyres up on my bike.Enlarging and inflatingBecoming bigger informal to increase something by a large amount: The US was able to pump up exports. Let's pump up the volume a bit!Increasing and intensifying
(Definition of pump sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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