We found one dictionary that defines the word gain one's spurs:

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1. gain one's spurs: Wiktionary

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