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to happen on
[phrase form: happen]
01
to find or encounter something without actively searching for it
Example
He happened on a valuable antique in his attic during spring cleaning.
She happened on a hidden trail while hiking in the forest.
I happened on an old bookstore while exploring the city.
The company's decline in profits happened on the CEO's watch, leading to questions about their leadership.
Accidents are more likely to happen on an undivided highway due to the lack of separation between lanes.