keep your hair on
保持冷静，不要激动或失去控制
口语·劝人冷静
英文释义
to remain calm or composed
例句
Keep your hair on! It's just a small mistake, we can fix it.
典故来源
源自19世纪英国俚语，生气时人常抓头发，劝人别抓即保持冷静。