go for it
- (idiomatic) To put maximum effort into achieving something.
To win the competition he has to beat his personal best, and he's going for it.
He really went for it.
- Go for it! You can win this!
- To decide to do something; especially after a period of hesitation.
His phone was off so I couldn't ask his permission, so I decided to just go for it
- May I use your bathroom? ― Go for it!