chance upon

To find something or meet someone without planning to — it just happens.

"The researchers chanced upon a previously unknown cave system during a routine survey."

Hear it in context

This Mountain Village in Japan Should Be Dying. Why Isn't It?

Abroad in Japan · 9:11

we're extremely lucky to chance upon a homestay

Driving Alone Across the World’s Longest Minefield

Eva zu Beck · 23:35

easy to chance upon a very sharp rock that could slash your tire.

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