bite one’s head off千万别理解成“把某人的头咬掉了”，这得多吓人啊！这个短语的意思是“大发雷霆；大发光火”，表达的是非常生气的意思。

【例句】
His mother nearly bit his head off when he got his new shoes dirty.
当他把新鞋弄脏时，他的母亲对他大发雷霆。

The boss was is such a bad mood today. He bit the new guy's head off for being two minutes late this morning.
老板今天心情很不好。他因为那个新来的家伙今天早上迟到了两分钟而狠狠地骂了他一顿。