Definition of soapbox noun from the Oxford Advanced American Dictionary

 

soapbox

 noun
noun
NAmE//ˈsoʊpbɑks//
 
 
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  • a small temporary platform that someone stands on to make a speech in a public place, usually outdoors
  • Idioms
    get/be on your soapbox(informal)
     
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    to express the strong opinions that you have about a particular subject She's on her soapbox about animal rights again!
    See the Oxford Advanced Learner's Dictionary entry: soapbox