Definition of brass monkey in English:

brass monkey

Syllabification: brass mon·key

noun

informal
  • Used in phrases to refer to extremely cold weather: it’s brass monkey weather tonight
    More example sentences
    • Similarly, pack your thermals, because it's colder than a brass monkey's ice lolly.
    • Actually the weather today is much milder than yesterday when it was cold enough to freeze the spheres off a brass monkey (an old sea-faring expression).
    • It got cold on the gun decks and the indentations in the brass monkey would get smaller than the iron cannonballs they were holding.

Origin

mid 19th century: often said to be from a type of brass rack or 'monkey' in which cannonballs were stored and which contracted in very cold weather, ejecting the balls, but this explanation has not been proved.

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody