We found one dictionary that defines the word flea's eyebrows:

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1. flea's eyebrows: Wiktionary

Definitions from Wiktionary (flea's eyebrows) ▸ noun:  Synonym of cat's whiskers ▸ Words similar to flea's eyebrows ▸ Usage examples for flea's eyebrows ▸ Idioms related to flea's eyebrows ▸ Wikipedia articles (New!) ▸ Words that often appear near flea's eyebrows ▸ Rhymes of flea's eyebrows ▸ Invented words related to flea's eyebrows