at the top of the hour

idiom

Definition of at the top of the hour

US
: at the beginning of the hour (at 12:00, 1:00, 2:00, etc.) The program is scheduled to start at the top of the hour.

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“At the top of the hour.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/at%20the%20top%20of%20the%20hour. Accessed 16 Jan. 2021.

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