隔山打隧道，里应外合隔山打隧道，裡應外合隔山打隧道，裏應外合

boring a tunnel through a mountain from both sides: inside and outside meet

Saying俗语俗語

Two-part saying歇后语歇後語 · Rarely used now

Meaning: Working in coordination from both sides to achieve a goal.

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Simplified: 隔山打隧道，里应外合
Traditional (Taiwan): 隔山打隧道，裡應外合
Traditional (Hong Kong): 隔山打隧道，裏應外合
Pinyin: géshān dǎ suìdào, lǐyìngwàihé
Bopomofo: ㄍㄜˊ ㄕㄢㄉㄚˇ ㄙㄨㄟˋ ㄉㄠˋ，ㄌㄧˇ ㄧㄥˋ ㄨㄞˋ ㄏㄜˊ

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

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