on the button   (TTS發音)

1. at the right place；at the heart of the matter準確；中肯

    His criticisms of our work were right on the button. 他對我們工作的批評是很中肯的。

2. exactly on time準時 She then strolled over to the department store at 5 o'clock on the button. 她後來5點鐘準時走到了百貨商店。