To give repeated orders and warnings.
令命令；申表达，说明。多次命令和告诫。
《史记·孙子吴起列传》约束既布，乃设铁钺，即三令五申之。”汉·张衡《东京赋》三令五申，示戮斩牲。”
The teacher gave the students three orders and five explanations about the exam rules.
Learn the next connected idiom: 三令五申 (sān lìng wǔ shēn) → 深入人心 (shēn rù rén xīn)
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