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English definition of “step sth up”

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step sth up

verb [I + adv/prep] uk phrasal verb with step   /step/ (-pp-) us  
to increase the size, amount, or speed of a process that is intended to achieve something: The police are stepping up their efforts to fight crime. Security has been stepped up at the airport.
(Definition of step sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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