run into
US /rʌn ˈɪntuː/
UK /rʌn ˈɪntuː/

1.
to meet someone unexpectedly
:
•
I didn't expect to run into you at the supermarket.
•
We often run into our old neighbors at the park.
2.
to experience an unexpected difficulty or problem
:
•
The project ran into some unexpected delays.
•
If you run into any problems, let me know.
3.
to collide with something or someone
:
•
The car ran into a tree.
•
He accidentally ran into another player during the game.