curse the day (one) was born

1. Of oneself, to regret having ever existed, as due to some extreme suffering one is or will be experiencing. Basic training in the military is so hard that you'll often find yourself cursing the day you were born. She was so embarrassed by the event that she cursed the day she was born. After making that gigantic blunder, I cursed the day I was born and tried to brace myself for being fired.

2. To detest someone to such a degree as to wish they had never existed. You're just a horrible, selfish pig, and I curse the day you were born! If he ever mistreats my daughter, I will certainly curse the day he was born. Listen here, bub—cross me like that again, and I'll curse the day you were born, got it?