"Across" is an English preposition that can mean several things depending on the context:
1. In or to the other side of: It indicates movement or position from one side to the other. For example:
"She swam across the lake."
"The cat went across the street."
2. Throughout: It can also mean covering or extending over an area or period. For example:
"The book covers the history of the world across the centuries."
"We need to look at the problem across the entire organization."
3. In all directions: It can imply that something extends or is done in all directions. For example:
"The wind was blowing across the fields."
"He looked across the room, searching for someone."
4. By way of: It can indicate passing through or over something. For example:
"The train travels across the mountains."
"The road goes across the forest."
5. At a distance: It can also mean from a distance. For example:
"I saw her across the room."
"He was across the street when I called out his name."
In a sentence, "across" often requires a noun or pronoun to complete the meaning. It can also be followed by prepositional phrases like "across the street," "across the table," or "across the country."
