IPA: /ˈɡɑːrdreɪl/
KK: /ˈɡɑrdˌreɪl/
A safety barrier placed along the edge of a road or a staircase to prevent accidents or falls.
The guardrail prevented the car from going off the road during the storm.
Guardrail → It is formed from "guard" (from Old French *guarder*, meaning to protect or keep safe) and "rail" (from Old English *regal*, meaning a bar or rod). The word "guardrail" refers to a protective barrier or railing that keeps people or vehicles safe.
Think of a 'guard' that 'protects' and a 'rail' that serves as a barrier — together, they form a guardrail that keeps you safe.
No commonly confused words.