swing for the fences

Từ điển Oxford Advanced Learner 8th

ˌswing for the ˈfences idiom
(NAmE)to really try to achieve sth great, even when it is not reasonable to expect to be so successful
•entrepreneurs who think big and swing for the fences
•Investors need to manage risk and not swing for the fences.
Main entry: ↑swing_idiom