be on the hour

To occur each time the clock turns to the next hour. When does the next bus come? Is it on the hour? Don't worry, our live updates will be every hour on the hour. Leave this station on—it's 3:57 and the next traffic report will be on the hour.

See also: hour, on

See also:

on the hour
on the hour/half-hour
till all hours
till all hours (of the day and night)
till/until all hours
by the hour
(a) quarter to (a given hour in time)
quarter past (a given hour in time)
zero hour
the top of the hour

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