If you step up something, you increase it or increase its intensity.
He urged donors to step up their efforts to send aid to Somalia...
= increase
PHRASAL VERB : V P n (not pron)
If you step up something, you increase it or increase its intensity.
He urged donors to step up their efforts to send aid to Somalia...
= increase
PHRASAL VERB : V P n (not pron)
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006