yīn​gōu​lǐ​fān​chuán

to fail unexpectedly

Senses

阴沟里翻船/ 陰溝裡翻船 yīn​gōu​lǐ​fān​chuán (also yīn​gōu​li​fān​chuán) to fail unexpectedly

to meet with unexpected failure in an easy or familiar situation; to suffer a setback where success seemed certain

References

synonym 大水冲倒龙王庙/大水沖倒龍王廟 阴沟里翻船/陰溝裡翻船