Definition from Wiktionary, the free dictionary
soapbox (plural soapboxes)
- (literally) A crate for packing soap, especially when used as a crude platform upon which a someone stands to deliver speeches.
- (figuratively) Any physical or media platform which gives prominence to the person on it and the views they espouse.
- The madman obtained a soapbox which he stood on at the corner of Broadway and Wall street, to shout out his prophesy of the end of the world.
- 2013, Robert F. Ely, Candidate for President (ISBN 148175582X), page 25
- Bernhard's last appearance on a late-night talk show was a handy soapbox to expound on his political message of patriotism, nationalism, and populism.
- (figuratively, idiomatic) A talk about one's pet topic (or the topic itself), especially when only tangentially relevant to an ongoing discussion.
- He's been on his soapbox all day about the new football coach.
- A soapbox car.
- To give a speech from (or as if from) a soapbox.