to take part in a public meeting or march (= an organized walk by many people), usually as a protest or to show support for something.

1[transitive] to show something clearly by giving proof or evidence demonstrate that… These results demonstrate convincingly that our campaign is working.

transitive. To exhibit (a quality, ability, feeling, etc.), esp. by action or behaviour; to display, reveal. Also: to express (one's feelings) demonstratively.

There are three meanings listed in OED's entry for the word demonstrate. See 'Meaning & use' for definitions, usage, and quotation evidence.

a public meeting or a march (= an organized walk by many people) at which people show that they are protesting against or supporting somebody/something.

a public meeting or march at which people show that they are protesting against or supporting someone or something

3 дня назад · DEMONSTRATE definition: 1. to show or make something clear: 2. to show something and explain how it works: 3. to express…. Learn more.

/dɪˈmɑːnstrəbli/ (formal) ​in a way that can be shown or proved. demonstrably unfair.

/dɪˈmɑːnstrəbl/ (formal) ​that can be shown or proved. a demonstrable need. There is no demonstrable link between the two events.

to make the meaning of something clearer by using examples, pictures, etc. illustrate something To illustrate my point, let me tell you a little story.