不耻下问 bùchǐ-xiàwèn not feel ashamed to ask and learn from one's subordinates

怎么记住“不耻下问”: 不 not + 耻 shame + 下 down + 问 ask = not feel ashamed to ask and learn from one's subordinates.

汉字

To not be ashamed to ask those below you in rank or knowledge - 他身居高位却不耻下问 (tā shēnjū gāowèi què bùchǐ-xiàwèn) despite his high position he isn't above asking juniors.
A praise term for humility in learning; the 下 means asking subordinates/inferiors, so don't use it for asking an expert (that's not the point).
Formal, classical register, common in essays and speeches about attitude toward learning.