shì​yǔ​yuàn​wéi

backfire

事与愿违 (事與願違) shì​yǔ​yuàn​wéi
backfire idiom
things turn out contrary to the way one wishes

I intended to help him, but it backfired and I ended up making matters worse.

Frequency

Movie subtitles
1.22 per million appears in 1% of films
Written text
1.44 per million

Sources

Definitions
CC-CEDICT