Exactly on time.
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Exactly on time, to the minute.
When something happens on the dot, it lands at the scheduled moment — not a minute early or late.
It suggests you can count on it.
"Sharp"
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Also means exactly on time, often used after a time — '9 o'clock sharp' — slightly more formal
"Right on Time"
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Similar but less emphatic — doesn't stress the same precision as 'on the dot'
"On the Dot"
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At just the right moment, when the timing happens to work out