noun
a strong fence at the side of a road or in a dangerous place to prevent people from falling off
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The guardrail along the highway is designed to prevent vehicles from going off the road.
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Make sure you stay on the right side of the guardrail when walking on the bridge.
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I almost hit the guardrail when I took that sharp turn on the road.
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The guardrail of his emotions finally broke, and he couldn't hold back his tears.