Definition of across preposition from the Oxford Advanced Learner's Dictionary

      

    across

     preposition
    preposition
    BrE BrE//əˈkrɒs//
     
    ; NAmE NAmE//əˈkrɔːs//
     
    , NAmE//əˈkrɑːs//
     
     
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  1. 1  from one side to the other side of something He walked across the field. I drew a line across the page. A grin spread across her face. Where's the nearest bridge across the river?
  2. 2  on the other side of something There's a bank right across the street.
  3. 3on or over a part of the body He hit him across the face. It's too tight across the back.
  4. 4in every part of a place, group of people, etc. synonym throughout Her family is scattered across the country. This view is common across all sections of the community.
  5. Word Origin Middle English (as an adverb meaning ‘in the form of a cross’): from Old French a croix, en croix ‘in or on a cross’, later regarded as being from a- ‘to, towards’ + cross.
See the Oxford Advanced American Dictionary entry: across