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muster sth up

phrasal verb with muster
 
/ˈmʌs.tər/
 
US  /-tɚ/ verb [I or T]

Definition

If you muster up a feeling of courage or energy, you try hard to find that quality in yourself because you need it in order to do something: [+ to infinitive] She finally mustered up the courage to ask him for more money.Brave and courageousPreparing
(Definition of muster sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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