on the hour

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on the hour

Occurring each time the clock turns to the next hour. Don't worry. We have nurses monitoring her condition on the hour until we see an improvement. We'll be bringing you live updates every hour on the hour.
See also: hour, on
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

on the hour

at each hour on the hour mark. I have to take this medicine every hour on the hour. I expect to see you there on the hour, not one minute before and not one minute after.
See also: hour, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

on the hour

At every hour exactly; one o'clock, two o'clock, and so on. For example, The shuttle to New York departs on the hour. An extension of this idiom is every hour on the hour, meaning every time the clock's big hand reaches twelve, as in The bus passes by the house every hour on the hour.
See also: hour, on
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

on the ˈhour/half-ˈhour

at exactly 5 o’clock, 6 o’clock, etc./ 5.30, 6.30, etc: Buses leave here for Oxford on the hour.
See also: hour, on
Farlex Partner Idioms Dictionary © Farlex 2017
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