on the hour
IDIOM
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English Dictionary(every hour) on the hourevery hour at six o'clock, seven o'clock etc
[TahlilGaran] Dictionary of Contemporary English ▲
Idiomson the hourat the time an hour begins.
Buses pull out every hour on the hour. [TahlilGaran] English Idioms Dictionary ▲
on the hourto be exactly on the hour mark (12:00, 1:00 etc.)
We give my grandmother her medicine on the hour.
[TahlilGaran] English Idioms Dictionary ▲
on the hour adv. phr. Each time the hour has zero minutes and zero seconds.
The uptown bus goes past the school on the hour. The woman must take her pill on the hour. [TahlilGaran] English Idioms Dictionary ▲