steal someone's thunder

Thunder这个词的意思是雷电。习惯用语steal someone's thunder，指的是剽窃某人尚未发表的想法观点或发明创造。这种行为往往出于嫉妒或者企图攫取他人的成果和荣誉。

to do what someone else was going to do before they do it, especially if this takes success or praise away from them

抢先(某人)做;(尤指)抢了(某人)的成功机会(或风头)

例：

Sandy stole my thunder when she announced that she was pregnant two days before I'd planned to tell people about my pregnancy.

在我打算告诉大家我怀孕的消息之前两天，桑迪抢先宣布她怀孕了，抢了我的风头。