1. To the opposite side
   "the football field was 300 feet across"
    
2. Transversely
   "the marble slabs were cut across";
   - crosswise, crossways

1. In the whole extent of; everywhere
   "climate change will be a problem across the world";
   - throughout, over, all over, all around, around, round
    
2. On the opposite side of
   "That store is across the street"
    
3. Encountered by chance or in the course of some activity
   "They came across some difficulties"
    
4. [Brit, Austral, informal] Fully informed about or familiar with
   "I assume you are across the last report"

Encyclopedia: Across