acrossacross /əˈkrɔs/ preposition, adverb 
► across preposition, adverb
► across preposition, adverb from one side of something wide or large to the other side: He ran across the street. When you look across the lake, you can see the mountains. The river is deep, so you can’t go across without a good boat.
► over preposition, adverb from one side of something that is high or deep to the other side: We flew over the mountains into Italy. Katie ran up to the wall and climbed over.
► through preposition, adverb from one side or end of a hole, crowd, forest, town, or country to the other side or end: I pushed my way through the crowd. We drove through Baltimore on our way to Washington. We found a gap in the fence and climbed through. ➔ You also use through when talking about someone seeing something on the other side of a window: Through the window I could see Mike in the kitchen.