不恥下問
Bow down one's ear.
Though old and wise, yet still advise.
It is lawful to learn even from an enemy.
eg:The teacher bowed down the ear to one of his students, asking him what one should do in such situation.
中英俚語俗語來源:論語:“敏而好學,不恥下問。”
反義詞:剛愎自用 Reckon without one's host.