Definition of tumbler noun from the Oxford Advanced American Dictionary

     

    tumbler

     noun
    noun
    NAmE//ˈtʌmblər//
     
     
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  1. 1a glass for drinking out of, with a flat bottom, straight sides, and no handle or stem
  2. 2(also tumblerful
    NAmE//ˈtʌmblərˌfʊl//
     
    )
    the amount held by a tumbler
  3. 3 (old-fashioned) an acrobat who performs somersaults (= a jump in which you turn over completely in the air)
See the Oxford Advanced Learner's Dictionary entry: tumbler