Definitions from Wiktionary (guardrail)

▸ noun:  A rail set alongside a dangerous place as a barrier, to improve safety.
▸ noun:  (Canada, US) A strengthened barrier installed on the sides of a (usually major) road to keep vehicles on the highway and reduce the risk and/or impact of crashes.
▸ noun:  (figurative, by extension) Any barrier designed to prevent accidents or mistakes.
▸ noun:  (rail transport) Synonym of check rail.
▸ Also see guardrail


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