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Meaning of 咬人狗儿不露齿

Lookup via: Pinyin | Radicals
yǎo rén gǒu r 齿 chǐ (Trad.: 咬人狗兒不露齒)
lit. the dog that bites does not show its fangs (idiom); fig. You can't tell the really dangerous enemy from his external appearance.