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Verb: miscalculate  mis'kal-kyu,leyt
  1. Judge incorrectly
    "I had miscalculated his determination";
    - misestimate
  2. (arithmetic) calculate incorrectly
    "I miscalculated the number of guests at the wedding";
    - misestimate

Derived forms: miscalculating, miscalculated, miscalculates

Type of: calculate, cipher, compute, cypher, figure [N. Amer], misjudge, reckon, work out