THIRD RAIL Definition & Meaning

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third rail

[ thurd reyl ]

Phonetic (Standard)IPA

noun

Railroads.
1. a rail laid parallel and adjacent to the running rails of an electrified railroad to provide electric current to the motors of a car or locomotive through contact shoes.
2. an additional running rail laid on the same ties as the two regular rails of a railroad track to provide a multigauge capability.
a controversial topic or issue in the public sphere that people, especially politicians, try to avoid discussing (often used attributively): Doping is the third rail of the Olympics.
a third-rail subject;
Doping is the third rail of the Olympics.
Social Security is the third rail of American politics.

third rail

noun

an extra rail from which an electric train picks up current by means of a sliding collector to feed power to its motors
politics
1. a cause or topic that is considered extremely dangerous for a person to support or comment on
2. ( as modifier )
  a third-rail issue

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�y��vlog History and Origins

Origin of third rail¹

An Americanism dating back to 1865–70

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Idioms and Phrases

Something that is dangerous to tamper with, as in Anything concerning veterans is a political third rail . This term alludes to the rail that supplies the high voltage powering an electric train, so called since 1918. On the other hand, grab hold of the third rail means “become energized.” Both shifts from the original meaning date from the late 1900s.

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Example Sentences

Republicans are dancing around the third rail of American politics and at least one GOP lawmaker has had enough.

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There’s a reason proposals to change Social Security are known as the third rail of American politics; the public relies on this program just as we rely on consumer protection rules.

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He knows a third rail when he sees one.

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It’d be great to have German generals that actually do what we ask them to do,’ maybe not fully being cognizant of the third rail of German generals who were Nazis, or whatever,” said Kilmeade.

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Political implications: Social Security is so popular among voters that it’s most often compared to the third rail of a subway track — the one that gets you electrocuted if you touch it.

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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