size something/someone up
phrasal verb with size verb [ T ] uk/saɪz/ us/saɪz/
打量;估计;判断
to examine something or someone carefully and decide what you think about it, him, or her
Voters are still sizing up the candidates. 选民们还在衡量各个候选人的情况。
The two cats walked in circles around each other, sizing each other up. 两只猫围着彼此绕圈，并且互相打量着。