sharpen (sth) up
— phrasal verb with sharpen uk /ˈʃɑː.pən/ us /ˈʃɑːr.pən/ verb [ T ]
(Definition of “sharpen (sth) up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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a group of people, especially within a political party, who try to encourage other people to follow a new, more interesting, or more active way of doing things