bite someone's head off idiom informal
无缘由地对…发火，莫名其妙地对…发脾气
to speak to someone in a quick, angry way, for no good reason
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！
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