sizing up

Verb

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

1. (idiomatic, transitive) 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.
2. (intransitive) To wear a larger size of clothing.
   • This shirt runs tight, so you should size up.