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