frost hollow

British

noun

a depression in a hilly area in which cold air collects, becoming very cold at night

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frost hollow

The hamlet sits in a frost hollow where, in the winter, cold air builds up to allow it to become so cold.

From BBC ● Jan. 10, 2026

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023