一个人咳嗽时吐另外一个人面上打一成语

一个人咳嗽时吐另外一个人面上的意思是相濡以沫。

【解释】濡：沾湿；沫：唾沫。泉水干了，鱼吐沫互相润湿。比喻一同在困难的处境里，用微薄的力量互相帮助。

【用法】用作褒义。多用在书面语里。一般作谓语、宾语、定语、状语。

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参考资料

庄子.《庄子·大宗师》.宋国蒙：庄子，战国时期