陰ㄧㄣyīn溝ㄍㄡgōu裡ㄌㄧ˙li翻ㄈㄢfān船ㄔㄨㄢˊchuán

  1. 事情的演變出乎意料之外。如：「這件事原本是計劃好的，怎奈半路殺出個程咬金來，真是陰溝裡翻船！」

英to meet with unexpected failure (idiom)​, to fail miserably (where failure was not expected)​