at the top of the hour
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.
From the M-W Editors
Word by Word Definitions
: the highest point, level, or part of something : summit, crown
: a garment worn on the upper body
: the head of a plant
: of, relating to, or being at the top : uppermost
: chief, leading
: of the highest quality, amount, or degree
: to be or become higher than : overtop
: to be superior to : excel, surpass
: to gain ascendancy over : dominate
: a commonly cylindrical or conoidal device that has a tapering point on which it is made to spin and that is used especially as a toy
: a time or office for daily liturgical devotion
: canonical hour
: the 24th part of a day : 60 minutes
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