We found one dictionary that defines the word gather up one's courage:

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1. gather up one's courage: Wiktionary

Definitions from Wiktionary (gather up one's courage) ▸ verb:  Synonym of pluck up one's courage ▸ Words similar to gather up one's courage ▸ Usage examples for gather up one's courage ▸ Idioms related to gather up one's courage ▸ Wikipedia articles (New!) ▸ Words that often appear near gather up one's courage ▸ Rhymes of gather up one's courage ▸ Invented words related to gather up one's courage