to spend a large amount of money in a way that is unnecessary or that wastes it

He lashed out £5,000 on his daughter's wedding. 他为女儿的婚礼一下子花了5000英镑。

to suddenly attack someone or something physically or criticize him, her, or it in an angry way

I was only teasing him and suddenly he lashed out (at me) and hit me in the face. 我只是在和他闹着玩，他却突然动起手来，一拳打在我的脸上。

Why's Tina in such a bad mood? She really lashed out at me when I was late for work. 蒂娜为什么情绪这么糟糕？我上班迟到了她就对我大发雷霆。