The difference between Brass monkeys and Freezing cold
When used as adjectives, brass monkeys means very cold, whereas freezing cold means extremely and unpleasantly cold.
Freezing cold is also noun with the meaning: extreme and unpleasant cold.
check bellow for the other definitions of Brass monkeys and Freezing cold
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Brass monkeys as an adjective (British, idiomatic, informal):
very cold
Examples:
"Blimey, it's brass monkeys out there today."
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Freezing cold as an adjective (idiomatic):
extremely and unpleasantly cold
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Freezing cold as a noun (idiomatic):
extreme and unpleasant cold