This page is about the phrasal verb size up
to observe carefully and then form an opinion about a person or a situation
assess, appraise (formal)
- size sb/sth up We were sizing you up from the moment you walked in for your job interview.
- size up sb/sth The boxers spent most of the first round sizing up each other.
Someone who is good at sizing people up must be
Contributor: Matt Errey