swing for the fences
Pronunciation:
verb
Definitions
To swing at the ball as hard as possible, with the aim of getting a home run, increasing the chance of missing the ball.
Example: Don't swing for the fences unless it's an easy ball; be content with running part way.
To do something extremely ambitious, especially rashly.
Example: I'm not going to swing for the fences tomorrow, but I'm hoping my speech will be warmly received.