Advocate (verb)

1. Publicly recommend or support (a particular policy or course of action).
2. Speak or write in support of (someone or something).
3. Act as a legal defender or representative.

Origin:

Late middle english: from old french avocat, from latin advocatus, past participle of advocare "call to one"s aid", from ad- "to" + vocare "call".

Examples:

1. He advocated for more funding for education.
2. She advocated for the rights of the marginalized.
3. He advocated for stricter gun control laws.
4. The organization advocates for the rights of animals.
5. The lawyer acted as an advocate for his client in the court.