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Meaning of 'Third rail'

What does the saying 'Third rail' mean?

Idiom: Third rail

Meaning:

The third rail of something is dangerous to alter or change. Originally, the third rail is the one carrying the electricity for a train.
Country: International English | Subject Area: General | Usage Type: Both or All Words Used
All idioms have been editorially reviewed. Submitted idioms may have been edited for correctness and completeness.
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