We found one dictionary that defines the word expand one's wings:

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1. expand one's wings: Wiktionary

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