tempt fate

verb2

1. •
   To take a risk.

   • Don't tempt fate by driving without a seatbelt.
2. •
   To take an imagined or superstitiously believed risk of provoking an adverse outcome by mentioning something or making a prediction.

   • I shouldn't tempt fate, but it looks like it's going to rain.
   • "I'm sure everything will work out fine" — "Don't tempt fate!"