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guardrail
(gärd′rāl′)
noun
- a railing that serves as a protective barrier, as on a staircase or alongside a highway
- ☆ an extra rail alongside the main rail of a railroad at a crossing, etc., as to keep the cars on the track
See guardrail in American Heritage Dictionary 4
noun
A protective railing, as on a staircase or along a highway.
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