On the dot

The phrase means “准时地”. When you want to convince someone that you would be on time for a meeting or a gathering（聚会）, you could say: Trust me. I’ll be there at 13:00 on the dot.

Sample sentence: Jenny is a person with principle（有原则的人）. She always arrives at her office 8:00 on the dot.

Well,i've got it. 

I also have some other words&pharses for sharing

punctually/ on time / on schedule. 

When willyou come back?Bond

I can say "I'll be there on thedot" next time.thanks