Literal meaning
not (不) — ashamed (耻) — below (下) — ask (问)
Origin
Analects (《论语·公冶长》). A disciple asks Confucius why a duke called Kong Wenzi (孔文子) was honoured with the posthumous title 文 ("the Cultured"). Confucius answers: 敏而好学,不耻下问,是以谓之文也 — "He was quick and loved to learn, and was not ashamed to ask those below him; that is why he was called the Cultured." The phrase carries that endorsement forward: humility before knowledge ranks higher than status anxiety, and the smartest people in any room are typically the ones still asking questions.
Examples
Usage & nuances
Praise rather than self-description. You'd say someone else 不耻下问, not really claim it about yourself (claiming it tilts towards humblebrag). Common in performance reviews, biographies, and obituary-style writing about scholars.
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