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Bump into sb
means to unexpectedly or accidentally meet or encounter someone, often when you weren’t planning to see them. It usually happens by chance in public places.
Examples:
1- While visiting New York City in the late 1800s, Nikola Tesla bumped into Thomas Edison at a local patent office, sparking their well-known rivalry in the field of electricity.
2- I bumped into my uncle at the zoo while I was trying to imitate a monkey. He thought I was part of the exhibit!