English dictionary muster up meaning and definition Definition and meaning of muster up at MeaningMonkey.org. muster up meaning and definition in the English Dictionary. MUSTER UP verbDefinition of muster up (verb)gather or bring together"muster the courage to do something"; "she rallied her intellect"; "Summon all your courage"synonyms: come up, muster, rally, summon Source: Princeton University Wordnet
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