一人当千 いちにんとうせん Also written いちにんとうぜん Meanings Noun being a match for a thousand Kanji 一 one. Read as イチ. 人 person. Read as ニン. 当 apply. Read as トウ. 千 thousand. Read as セン. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists