on the hour

1. 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.

Example Sentences

However, on the hour, she misjudged her entry into a breakdown to make a regulation clearout.

From BBC

The second on the hour mark was effectively the moment that sealed the success at 3-0 - a calm sweeping first-time finish into the bottom corner from 10 yards out after Ella Toone's effort had been saved.

From BBC

The forward also gave the Blues an attacking focal point, competing in nine duels and four aerial duels before being replaced by Nicolas Jackson on the hour mark.

From BBC

In total, he had 54 touches of the ball against Wydad Casablanca before being substituted on the hour mark for Rodri - and became the first Englishman to score in multiple editions of the Club World Cup.

From BBC

The starting gun for the first heat had gone off more than four hours earlier, and new heats were heading out every hour on the hour.

From Los Angeles Times