外贼易打，内贼难防外賊易打，內賊難防外賊易打，內賊難防

outside thieves are easy to fight, inside thieves are hard to guard against

Saying俗语俗語

Proverb谚语諺語 · Widely known

Meaning: Enemies in the open are easy to deal with, but traitors or wrongdoers within your own ranks are hard to guard against. A warning to be wary of insiders.

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Simplified: 外贼易打，内贼难防
Traditional (Taiwan): 外賊易打，內賊難防
Pinyin: wài zéi yì dǎ, nèi zéi nán fáng
Bopomofo: ㄨㄞˋ ㄗㄟˊ ㄧˋ ㄉㄚˇ，ㄋㄟˋ ㄗㄟˊ ㄋㄢˊ ㄈㄤˊ

Written with HSK 7-9 vocabulary, at CEFR level C1.

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