on the dot

US /ɑn ðə dɑt/
UK /ɑn ðə dɑt/
"on the dot" picture
1.

exactly at the specified time

:
•
The train arrived at 10:00 AM on the dot.
•
She always starts her meetings at 9:00 AM on the dot.
:
dotteddotdot-compolka-dottedpolka dotsign on the dotted linedot the i's and cross the t's