American English

Definition of size up phrasal verb from the Oxford Advanced American Dictionary

 

size up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

size somebody/somethingup

(informal)
 
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to form a judgment or an opinion about someone or something She knew that he was looking at her, sizing her up. He sized up the situation very quickly.
See the Oxford Advanced Learner's Dictionary entry: size up