What is the meaning of run into?

verb

• Be beset by.
  • usage: "The project ran into numerous financial difficulties"
  • synonyms: encounter
• Collide violently with an obstacle.
  • usage: "I ran into the telephone pole"
  • synonyms: bump into, jar against, butt against, knock against
• Hit against; come into sudden contact with.
  • usage: "The car hit a tree"; "He struck the table with his elbow"
  • synonyms: hit, strike, impinge on, collide with
• Come together.
  • usage: "I'll probably see you at the meeting"; "How nice to see you again"
  • synonyms: meet, encounter, run across, come across, see