not bat an eyelid
面不改色地对待或回应令人吃惊或令人不满意的事情
口语·形容镇定或不动声色
英文释义
to not show any surprise, emotion, or reaction
例句
He didn't bat an eyelid when the waiter spilled wine on him.
典故来源
与“not bat an eye”同源，英国英语更常用，强调面部表情不变。