準時;正好
at exactly the right time or at the exact time mentioned
We arrived at 4 o'clock on the button.我們在 4 點鐘準時到達。
精確;準確;確切
exactly right
You're on the button there!那讓你說中了!
釋義來自《牛津高階英漢雙解詞典》第 9 版