A four-character idiom meaning someone who can match a thousand people; extremely capable or outstanding.
彼は一人当千の働きでチームを救った。
He saved the team with work worthy of a person who can match a thousand.
この若手選手は将来、一人当千の選手になるだろうと言われている。
This young athlete is said likely to become a player who can match a thousand in the future.
彼女のリーダーシップは一人当千の価値がある。
Her leadership is worth that of someone who can match a thousand.