不耻下问
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.
中英俚语俗语来源:论语:“敏而好学,不耻下问。”
反义词:刚愎自用 Reckon without one's host.