marcher
noun [ C ] uk/ˈmɑː.tʃər/ us/ˈmɑːr.tʃɚ/
抗议游行者，游行示威者
a person marching through a public place as part of a public event
The marchers stopped outside the American embassy, chanting slogans and waving banners. 示威者在美国大使馆外停了下来，高喊口号，挥舞标语。