unsung hero

One who does great deeds but receives little or no recognition for them.

Japanese Meaning

大いなる業績を挙げるが、十分な評価や認識を受けない人物 / 名もなき英雄 / 陰の立役者

The hospital janitor became an unsung hero when he stayed overnight to comfort frightened families during the emergency.

病院の清掃員は、緊急事態の際に怖がる家族を慰めるために夜通し残り、縁の下の力持ちとなった。

Sense（1）

One who does great deeds but receives little or no recognition for them.

Embedded computers are the unsung heroes of modern life.

unsung heroes

（ plural ）