1
general::
1. Also, bump against. Collide, come in contact with; same as BANG INTO. For example, It's easy to bump into furniture in the dark. [Mid-1800s] 2. Encounter, meet by chance, as in While I was downtown, I bumped into George. [Colloquial; 1880s] Also see RUN INTO.
American Heritage Idioms
2
general::
Phrase(s): bump into someone [and] run into someone
1. Lit. to move inadvertently or crash into someone. • Excuse me. I didn’t mean to bump into you. • The child on the bicycle nearly bumped into me. 2. Fig. to chance on someone; to meet someone by chance. (Not normally with physical contact.) • Guess who I bumped into downtown today? • I ran into Bill Jones yesterday.
McGrawhill's American Idioms And Phrasal Verbs