What does 'bump into' mean?

[Bumpy]

English Language Tests, Intermediate level

ESL/EFL Test #440 "English Slang Idioms (179)", question 1

"I hate how one keeps ......... into the one person he or she doesn't want to see. I have tried my hardest to avoid my ex-girlfriend Sally and I have run into her three times in the past month. It isn't like this is a small town," Jeff said to Christian.

(a) stopping
(b) jumping
(c) bumping
(d) discovering

English Language Tests, Intermediate level

ESL/EFL Test #440 "English Slang Idioms (179)", answer 1

"I hate how one keeps bumping into the one person he or she doesn't want to see. I have tried my hardest to avoid my ex-girlfriend Sally and I have run into her three times in the past month. It isn't like this is a small town," Jeff said to Christian.

Correct answer: (c) bumping
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walk into

[Alan]

Hi,

'Bump into' means 'meet someone by chance'. 'Walk into' could be simply 'enter' or 'knock into something while you are walking'.

Alan
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English as a Second Language
You can read my ESL story A spring in your step