Third rail meaning

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
Contributor:
All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.
« Previous: Third degree
Next: Third time lucky »

Idiom eBooks from UsingEnglish.com

Download our curated lists of idioms in PDF format - perfect to use offline for reference or for use in class!

150 British English Idioms
100 American English Idioms
225 Animal Idioms

If you have a question about idioms, ask us about it in our Idioms Discussion Forum.

If you know of an idiom that you would like to be listed here, please use our online form to suggest an idiom.

See also:


Trustpilot