Definition of every hour on the hour
: at the beginning of each hour (at 12:00, 1:00, 2:00, etc.)
Trains leave the station every hour on the hour.
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“Every hour on the hour.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/every%20hour%20on%20the%20hour. Accessed 21 Jun. 2021.
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