on the dot

Prepositional phrase

idiomatic

(idiomatic) Exactly; precisely, especially of a time of day.

Japanese Meaning

ちょうど（正確な時刻・タイミングで） / ピッタリ（指定された時間に）

The meeting started at 3:00 on the dot, so don't be late.

会議は3時ちょうどに始まったので、遅れないでください。

Sense（1）

(idiomatic) Exactly; precisely, especially of a time of day.

He arrived at 10 o'clock, on the dot.