Definition of hash noun from the Oxford Advanced Learner's Dictionary

     

    hash

     noun
    noun
    BrE BrE//hæʃ//
     
    ; NAmE NAmE//hæʃ//
     
    Punctuation
     
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  1. 1 [uncountable, countable] a hot dish of cooked meat and potatoes that are cut into small pieces and mixed together corned beef hash
  2. 2 [uncountable] (informal) = hashish
  3. 3(also hash sign) (both British English) (North American English pound sign) [countable] the symbol ( # ), especially one on a telephone See related entries: Punctuation
  4. Word Originnoun sense 1 and make a hash of something. late 16th cent. (as a verb): from French hacher, from hache ‘axe’, from medieval Latin hapia, of Germanic origin. noun sense 3 1980s: probably from hatch ‘shade an area with parallel lines’, altered by folk etymology.Idioms
    make a hash of something
     
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    (informal) to do something badly I made a real hash of the interview.
See the Oxford Advanced American Dictionary entry: hash