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.
- On the hustle
adjective phrase Living by constant petty frauds and crimes; watchful for dupes: sleeping till ten in the morning, on the hustle in the streets or the poolrooms (1970s+)
- On the increase
Growing, especially in frequency of occurrence, as in Violent crime is on the increase. [ Mid-1700s ]
- On the inside
adverb phrase Having access to the most confidential information; near the focus of power and influence (1932+) In a position of confidence or influence, as in The new reporter said he got his facts from at least one official on the inside. [ c. 1930 ]
[on-th uh-job, awn-] /ˈɒn ðəˌdʒɒb, ˈɔn-/ adjective 1. done, received, or happening while in actual performance of one’s work: on-the-job training.