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

      

    across

     adverb
    adverb
    BrE BrE//əˈkrɒs//
     
    ; NAmE NAmE//əˈkrɔːs//
     
    , NAmE//əˈkrɑːs//
     
    For the special uses of across in phrasal verbs, look at the entries for the verbs. For example come across is in the phrasal verb section at come.
     
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  1. 1  from one side to the other side It's too wide. We can't swim across. The yard measures about 50 feet across.
  2. 2  in a particular direction towards or at somebody/something When my name was called, he looked across at me.
  3. 3  across from opposite There's a school just across from our house.
  4. 4(of an answer in a crossword) written from side to side I can't do 3 across.
  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