壹個人咳嗽時吐另外壹個人面上的意思是相濡以沫。
解釋濡：沾濕；沫：唾沫。泉水幹了，魚吐沫互相潤濕。比喻壹同在困難的處境裏，用微薄的力量互相幫助。
用法用作褒義。多用在書面語裏。壹般作謂語、賓語、定語、狀語。
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參考資料
莊子.《莊子·大宗師》.宋國蒙：莊子，戰國時期