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Meaning of 咬人的狗不露齿

Lookup via: Pinyin | Radicals
咬 yǎo 人 rén 的 de 狗 gǒu 不 bù 露 lòu 齿 chǐ (Trad.: 咬人的狗不露齒)
lit. the dog that bites doesn't show its teeth (idiom); fig. the most sinister of people can look quite harmless