志士(しし)

しし
noun
patriot; activist for a cause
formalhistoryperson
1. patriot; committed activist; man of high purpose
A person who devotes himself to a great cause, especially to his country. Most often used of the activists of the Bakumatsu period who worked to overthrow the shogunate.
彼(かれ)は維新(いしん)の志士(しし)だった。
He was one of the patriots of the Restoration.
Sakamoto Ryōma is known as one of the patriots of the late shogunate.
The young patriots risked their lives to build a new nation.

Literally "a man of resolve" (志(こころざし), aspiration + 士(し), samurai, gentleman). The word carries strong admiration and is used almost only in historical contexts.

Common expressions

Usage

Not used of present-day activists, who are 活動家(かつどうか); calling someone a 志士(しし) today sounds grand or tongue-in-cheek.