Phrases Phrases for Expressing Regret

I have cause to rue the day...

C2

Meaning

Expressing strong regret about a past event.

Example sentences

John: 'That investment didn't pan out as expected.'

Alice: 'I know. I have cause to rue the day I made that decision.'

John: 'I have cause to rue the day I agreed to this. It's been an utter disaster.'

Alice: 'Things haven't gone as planned.'