chivalrous spirit; chivalry
「男気」 has another reading with different meanings.
male presence
female presence
彼の男気ある行動に皆が感動した。
Everyone was moved by his chivalrous action.
男気を見せて弱者の味方をした。
He showed his manly spirit and stood up for the weak.
男気のある兄貴分として慕われていた。
He was admired as a chivalrous big-brother figure.