Meaning

noun someone who fights with his fists for sport

noun a workman employed to pack things into containers

noun a member of a nationalistic Chinese secret society that led an unsuccessful rebellion in 1900 against foreign interests in China

originNamed Boxers by the West, since their official title was "The Fist of Righteous Harmony" (義和拳 /义和拳 (Yìhéquán)) and their symbol was a clenched fist.

Etymology from Wiktionary, CC BY-SA 3.0