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One who makes an impassioned, impromptu speech. (Soapboxes were once commonly used as makeshift platforms for such speeches.) It seems like there's a soapbox orator on every corner in this city. Sorry, I couldn't hear you over that soapbox orator who's ranting about the government.
See also: soapbox
get on (one's) soapbox
To share one's opinions in an impassioned, impromptu manner, often to others' annoyance. (Soapboxes were once commonly used as makeshift platforms for such speeches.) Once grandpa got on his soapbox about the local election, I found an excuse to slip out of the room.
on one's soapbox
Expressing one's views passionately or self-importantly, as in Dexter can't resist getting on his soapbox about school expenditures. This expression comes from the literal use of a soapbox as an improvised platform for a speaker, usually outdoors. [Mid-1600s]
on your soapbox
If someone is on their soapbox, they are giving their opinions about a subject that they feel strongly about. I love getting on my soapbox. If I have something to say, I put pen to paper. In the early days I was very much on my soapbox, making it clear that I was a properly qualified scientist. Note: You can also say that someone gets off their soapbox if they stop telling you their opinions about something. I'm getting off my soapbox for the moment, but I'd like to see you on yours. Note: Soapbox is used in many other structures with a similar meaning. He turned the courtroom into a soapbox.
on your soapboxenergetically stating your opinions, especially ones which are already well known on a subject that you often revert to.
Soapboxes (originally boxes in which soap was packed and transported) were in the past often used as makeshift platforms by public speakers.
be/get on your ˈsoapbox(informal) express the strong opinions that you have about a particular subject: Don’t mention the Internet in front of him, or he’ll get on his soapbox and we’ll be here all night listening to his opinions about the evils of modern technology.
A soapbox is a small box that somebody speaking in public, especially outdoors, might stand on so that they could be seen and heard more easily.
on (one's) soapbox
Speaking one's views passionately or self-importantly.