swing for the fences

verb2

1. •
   (US) To swing at the ball as hard as possible, with the aim of getting a home run.

   • Don't swing for the fences unless it's an easy ball; be content with running part way.
2. •
   (US) To do something extremely ambitious, especially rashly.

   • I'm not going to swing for the fences tomorrow, but I'm hoping my speech will be warmly received.