We found one dictionary that defines the word new year's flask:

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1. New Year's flask: Wiktionary

Definitions from Wiktionary (New Year's flask) ▸ noun:  Synonym of New Year's bottle ▸ Words similar to new year's flask ▸ Usage examples for new year's flask ▸ Idioms related to new year's flask ▸ Wikipedia articles (New!) ▸ Words that often appear near new year's flask ▸ Rhymes of new year's flask ▸ Invented words related to new year's flask