swift brick
noun1
A hollow brick included in a building's outer wall to provide a nesting cavity for endangered swifts.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
noun
A hollow brick included in a building's outer wall to provide a nesting cavity for endangered swifts.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
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