Definition of "bump into" [bump into]

• To collide with. (verb)
• To cause (a thing) to collide with. (verb)
• To meet by chance. (verb)

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• "Random molecular motions always cause individual hemoglobins to bump into each other."
• "I knew that Azher would be back early, too, to prepare for a course he would be assistant-teaching the following semester, and it seemed only natural that I might bump into him."
• "The clouds run from right on the deck to well about 50,000 feet, and as they grow, they roam back and forth and bump into each other, causing more thunder-bumpers and confusion."