go to bat for someone = help out and support someone
棒球是美國人喜歡的一種運(yùn)動，去幫別人擊棒球，表示去幫助別人。

范例對話:
A: Is it true that Don got into some trouble at work last week?
Don上周工作上遇到了些麻煩。

B: Yes, he did. He was reproached for not turning in his sales reports, but his secretary went to bat for him.
是的。他被責(zé)備沒有交銷售報告，但是他的秘書幫了他的忙。

A: What was she able to do?
她能做什么？

B: She helped him out a great deal by admitting that she had misplaced the reports that he gave her to be typed.
她承認(rèn)她將Don讓她打的材料放錯了地方，從而來幫Don解圍。

A: So, it was her fault, not his.
喔，那是她的錯，而不是Don的錯。

B: Right.
是的。