Take the plunge

Take the plunge: decidir-se por uma ação arriscada, tomar uma atitude arriscada e perigosa

“I'd always wanted to be a writer, so when I was thirty I took the plunge. I quit my nine-to-five job and worked full-time on my novel instead.”

“Bill decided to take the plunge and put all his money into the stock market - just before the market crashed. Now he wishes he'd left it in the bank.” (www.englishclub.com)