busy beaver

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busy beaver (plural busy beavers)

  1. (informal) Someone who is very busy or hard-working.
    Wow! Laundry, dishes, and errands, all in one day? You've been a busy beaver.
  2. (computing theory) A Turing machine that attains the maximum number of steps performed, or number of non-blank symbols finally on the tape, among all Turing machines in a certain class.

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