I did it to get back at her.可不是說挽回她，而是指報復她！

get back意思是"回來、重新"的意思，get back at someone意思是「使…回到某人身上」，引申意思就是報復某人，因為曾經的過節找到機會報復在某人身上，使某人對自己曾經造成的損失或傷害，也回應到對方身上。

看看老外聊天時怎麼用get back at someone：

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A Pam poured coffee on my new dress，so I put whiskey in her coffee to get back at her.

B You two really hate each other，don't you？

A帕姆把咖啡潑到我的新裙子上，所以我在她的咖啡里加酒來報復。

B你們真的痛恨對方。

get back at someone例句精選：

The divorce process should not be used as a means to get back at your former partner

不應該在辦理離婚手續上報復以前的伴侶。

I'll get back at him one day!

總有一天我會向他報仇的！

She has promised that she will get back at him for the things he said about her poems.

她已保證，就他對她的詩所說的那些話，要對他進行報復。

表達報復，除了get back at someone外，還可以這樣說：

get even 報復

My brother gave my real report card to Mom，so I hid his MP3 player to get even.

我弟把我真的成績單給媽看，所以我把他的MP3隨身聽藏起來當作報復。

pay back 報復

One day I will pay back for all my cookies he ate.

我總有一天要報復他偷吃我的餅乾。