指前进之道反若后退。
《老子》明道若昧，进道若退。”
虽老氏曲全，～，然行亦以需。★《后汉书·张衡传》
Learn the next connected idiom: 进道若退 (jìn dào ruò tuì) → 退避三舍 (tuì bì sān shè)
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