We found one dictionary that defines the word Dad's Day:

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1. Dad's Day: Wiktionary

Definitions from Wiktionary (Dad's Day) ▸ noun:  (informal) Father's Day ▸ Words similar to Dad's Day ▸ Usage examples for Dad's Day ▸ Idioms related to Dad's Day ▸ Wikipedia articles (New!) ▸ Words that often appear near Dad's Day ▸ Rhymes of Dad's Day ▸ Invented words related to Dad's Day