on the half hour

idiom

Definition of on the half hour

: at half past the hour : at 12:30, 1:30, 2:30, etc. Tours start on the half hour.

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“On the half hour.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20the%20half%20hour. Accessed 28 Nov. 2020.

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