A deep rut or pothole in a road, created by wear or damage to the surface.
From 'chuck' (possibly meaning to jolt or bump) plus 'hole,' describing the bouncy, jolting experience of driving through such a hole.
British English speakers use 'chuckhole' while Americans say 'pothole,' and the British term's emphasis on the jolting sensation ('chuck') shows how word choice reflects people's actual experience—British roads made you 'chuck' around!
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