A soapbox is a small temporary platform on which a person stands when he or she is making a speech outdoors. One of them climbed aboard a soapbox and began informing the locals why gays should be allowed in the military
A crate for packing soap, or, by extension, any inexpensive crude platform raised above the surrounding level to give prominence to the person on it, especially when used for speeches
If you say that someone is on their soapbox, you mean that they are speaking or writing about something they have strong feelings about. We were interested in pushing forward certain issues and getting up on our soapbox about them. if someone is on their soapbox, they are telling people their opinions about something in a loud and forceful way on your soapbox