郑人买履
Traditional (Taiwan):
鄭人買履
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the person from Zheng 郑 zhèng who wanted to buy shoes (an allusion to an ancient story about somebody who, when buying a pair of shoes, preferred to rely on their foot measurements rather than just trying them on) (idiom)
lit.
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disregarding the sensible approach in favor of adherence to a fixed idea
fig.
Character by character
Sources