We found one dictionary that defines the word Boris's den:

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1. Boris's den: Wiktionary

Definitions from Wiktionary (Boris's den) ▸ noun:  (bingo) ten ▸ Words similar to Boris's den ▸ Usage examples for Boris's den ▸ Idioms related to Boris's den ▸ Wikipedia articles (New!) ▸ Words that often appear near Boris's den ▸ Rhymes of Boris's den ▸ Invented words related to Boris's den