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sprag
Common sparrow: I found a bunch of sprag's nest in the ceiling. Compare spagger, spoggy, sproggy.
Contributor's comments: Quite another meaning: SA Railways used the term - in print - for a piece of wood tied through wheel spokes to hold an unbraked wagon. This may be international, but the word is not in the Pocket Oxford.
Editor's comments: This is standard English. Not regional.