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Meaning of 嘴上没毛,办事不牢

Lookup via: Pinyin | Radicals
嘴 zuǐ 上 shàng 没 méi 毛 máo , , 办 bàn 事 shì 不 bù 牢 láo (Trad.: 嘴上沒毛,辦事不牢)
a youth without facial hair cannot be relied upon (proverb)