Meaning offall uponin English

Verb

1. to attack or invade suddenly; set upon
   The enemy troops will fall upon the city tonight.
2. to experience something unwanted; suffer
   The company will fall upon hard times if it doesn't adapt.
3. to discover or find something by chance
   While hiking, we fell upon an old, hidden map.
4. to occur at a specific time
   The anniversary of her graduation will fall upon a Sunday.