noun

guardrail

GARD-rayl

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Guardrail (noun) means a rail fixed beside a dangerous drop or edge to act as a safety barrier. Example: “He gripped the guardrail as he leaned over to look down the cliff.”

noun

A rail fixed beside a dangerous drop or edge to act as a safety barrier.

"He gripped the guardrail as he leaned over to look down the cliff."

"The stairwell has a metal guardrail on the open side."

"Workers installed a guardrail along the platform edge."

British: crash barrier A strengthened barrier fitted along the side of a road to keep vehicles from leaving it and to lessen the harm of a crash.

"The car clipped the guardrail and spun back onto the road."

"A new guardrail was put up along the sharp bend after the accident."

"The motorway guardrail buckled but held the lorry back."

figurative A rule, limit or safeguard put in place to stop mistakes or harmful outcomes.

"The company built guardrails into the software to stop staff deleting live data by accident."

"Regulators want stronger guardrails around how the new technology is used."

"Without clear guardrails, the project risked running over budget unchecked."

How to use guardrail

Learner’s notes

In plain EnglishA guardrail is a barrier that stops something going wrong, whether that is a fall, a crash, or a mistake.

When to use it

The road-safety sense is more common in North America; British English tends to say crash barrier for the same thing.

Memory tip

Think of guardrail as guard plus rail: something that guards by standing in the way.

Trace the full origin ↓

Common pairings

metal guardrail put up a guardrail install guardrails road guardrail safety guardrails

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C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

Test yourself on “guardrail” A quick quiz — meaning, synonyms & usage →

Fill the gap

Can you complete this real example?

He gripped the _____ as he leaned over to look down the cliff.

Etymology

Guardrail is a straightforward compound formed from guard and rail. The word simply joins the two existing English elements to name a rail that guards.

Origin: English

Synonyms

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guard railing guide rail crash barrier traffic barrier

Rhymes for guardrail

rail tail pail mail nail sail fail hail jail vail bail wail

See all rhymes for guardrail →

Frequently asked questions

What is a guardrail used for?

It is a barrier fitted beside a drop, edge or road to protect people or vehicles from falling or crashing. The same word is also used figuratively for a rule or safeguard that prevents mistakes.

Is a guardrail the same as a crash barrier?

In British English, crash barrier is the usual term for the road-safety version of a guardrail. The two describe the same kind of structure alongside a road.

Can guardrail be used outside of roads and buildings?

Yes, it is often used figuratively for a limit or safeguard designed to stop errors, such as a rule built into a piece of software or a policy.

What is the meaning of guardrail?

"guardrail" (noun) means a rail fixed beside a dangerous drop or edge to act as a safety barrier.