A soapbox is a small platform that someone stands on to give a speech to a crowd of people.
Soapboxes are often used by people who want to share their opinions or ideas with others.
Examples:
He stood on the soapbox and talked to the people.
The man brought his own soapbox to the park.
She spoke from the soapbox about helping animals.
The little girl pretended her tricycle was a soapbox.
The politician used the same old speech from his soapbox.
The cat jumped onto the soapbox and meowed loudly.