1. a protective barrier along the edge of a road, bridge, or elevated structure to prevent vehicles or people from falling off
2. a safety measure or protective mechanism that prevents errors or dangerous situations
Usage: figurative

Examples

• The car crashed through the guardrail and rolled down the embankment.
• Workers installed new guardrails along the mountain highway.
• The bridge’s guardrails were damaged in the storm.
• The company implemented guardrails to prevent data breaches.
• Safety guardrails help protect workers on construction sites.
• The guardrail prevented the vehicle from going over the cliff.
• New guardrails were added as a protective measure for pedestrians.