exactly on time
at a precise time
punctually
precisely
promptly
We were asked to be there at five on the dot.
The Metro train arrived at five o’clock on the dot.
Ruth came promptly on the dot of nine.
The birthday party will begin at 7 on the dot.
My daughter leaves for school at six on the dot at early morning.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.