不動聲色;面不改色;眼睛都不眨一下
to show no surprise or embarrassment when sth unusual happens
She didn't bat an eyelid when I told her my news.我把我最近的事告訴她時,她一點也不為所動。
釋義來自《牛津高階英漢雙解詞典》第 9 版