Definitions of muster up. verb. gather or bring together. synonyms: come up, muster, rally, summon. type of: collect, garner, gather, pull together.

Is muster up an idiom?

To summon, gather, or cobble something together. Said especially of intangible qualities, such as courage, determination, etc. Eventually I mustered up the courage to go over and ask him for his phone number.

What does muster mean slang?

Muster is defined as to bring or gather something together. An example of muster is bringing a group of friends together to help a friend in need. verb. 3.