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to size up (third-person singular simple present sizes up, present participle sizing up, simple past and past participle sized up)

  1. (idiomatic) To evaluate; to estimate or anticipate the magnitude, difficulty, or strength of something.
    It's a good idea for boxers to size up their opponents before their matches.
    Before we can begin to size up the problem, we'll need more information.
    • The Century
      We had to size up our fellow legislators.