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1.
When you come across (something) you run into something, most often good things and without planning to do so. One can come across e.g. stuff (books, speakers, you name it), a person, information, and much more.
Very often used in past tense, because you are telling what you came across.
- I came across a Beatles LP a while ago - the joy!

- Yesterday I came across Dave. Man, he has really aged.

- Have you come across our new boss yet?
by Oli_SE April 24, 2013