We found one dictionary that defines the word upper berths:

General (1 matching dictionary)

1. upper berths: Vocabulary.com

(Note: See upper_berth as well.)

Definitions from WordNet (upper berth) ▸ noun:  the higher of two berths ▸ Also see upper_berth ▸ Words similar to upper berths ▸ Usage examples for upper berths ▸ Idioms related to upper berths ▸ Wikipedia articles (New!) ▸ Words that often appear near upper berths ▸ Rhymes of upper berths ▸ Invented words related to upper berths