noun, noun or participle which takes 'suru', intransitive verb
return to the line of battle; comeback; return to the game
Originally a military term for returning to the battle line; now also used figuratively for returning to a game, competition, or active role after an absence or injury.
負傷した選手が戦列復帰を果たした。
The injured player made a comeback to the team.
彼
He returned to the line of duty after a long convalescence.