third rail

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noun

: a metal rail on a train track that carries electric current to the train's motor

: a difficult issue that politicians try to avoid talking about

Full Definition of THIRD RAIL

1

:  a metal rail through which electric current is led to the motors of an electric vehicle (as a subway car)

2

:  a controversial issue usually avoided by politicians

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Examples of THIRD RAIL

1. Social Security is the third rail of American politics.

First Known Use of THIRD RAIL

1867

Rhymes with THIRD RAIL

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