noun
Refers to a person who actively fights for a cause, ideal, or in a literal combat role. Often used in political, social, or sports contexts. The gloss 'boxer' is a specific sports usage.
彼は自由の闘士として知られている。
He is known as a fighter for freedom.
その政治家は改革の闘士を自称している。
The politician calls himself a champion of reform.