soap·box (sōp'bŏks')
n.

1. A carton in which soap is packed.
2. A temporary platform used while making an impromptu or nonofficial public speech.

intr.v. Informal, -boxed, -box·ing, -box·es.
To engage in impromptu or nonofficial public speaking, often flamboyantly.

idiom:

on (one's) soapbox

1. Speaking one's views passionately or self-importantly.

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The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

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