阴沟里翻船 (陰溝裡翻船) yīngōu lǐ fānchuán

yīngōu lǐ fānchuán phrase to meet with unexpected failure; to fail miserably (where failure was not expected)
Domain: Proverb 谚语
Notes: (CC-CEDICT '陰溝裡翻船')