The preposition across talks about movement from one side to another, usually two-dimensional lines for example Room, or a River.
- How are we going to get across the river?
- The painting is across the room
Across can also be used to describe something that stretches from one side to the other.
- There were people lined up across the road.
- The policed put up barriers across the road.
Across can also be used to describe places that are opposite the speaker.
- The Pharmacy is across the road.
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