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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.
    • 2017 July 16, Brandon Nowalk, “Chickens and dragons come home to roost on Game Of Thrones (newbies)”, in The Onion AV Club[1]:
      She approaches like she’s sizing them up. Five boys. Unarmed. A pile of swords over there. Ed Sheeran is there, but that’s not even the surprise.
    • The Century
      We had to size up our fellow legislators.
  2. To wear a larger size of clothing.
    This shirt runs tight, so you should size up.