bite sb's head off

to speak to someone in a quick, angry way, for no good reason

无缘由地对…发火，莫名其妙地对…发脾气

I only asked if I could help - there's no need to bite my head off!

我只是问了一下我能否帮上忙——没必要无缘无故地对我发火!

" I know it is, Harry, so will you please stop biting my head off? " said Hermione wearily.

“我知道是事实，哈利，你能不能不要这样冲我大声嚷嚷?”赫敏不耐烦地说，