advocate
UK: ˈæd.və.keɪt | US: ˈæd.və.keɪt
n. a person who publicly supports or recommends a particular cause or policy
vt. to publicly recommend or support
vi. to plead in favor of
The word "advocate" originates from Latin advocatus, combining ad- (toward) and vocare (to call). Historically, an advocate was someone "called to" assist or plead for another, especially in legal contexts. The root voc (voice/call) reflects the act of speaking on behalf of others. Over time, the term broadened to include public support for causes beyond legal defense.
She is a passionate advocate for environmental conservation.
The lawyer will advocate for the defendant in court.
Many doctors advocate a balanced diet for better health.
He advocates stricter regulations on pollution.
The organization advocates equal rights for all.