Sizing up is a phrase that means to assess or evaluate someone or something. There are a number of synonyms for sizing up that can be more precise or evocative depending on the context. Some of these include appraise, scrutinize, evaluate, weigh, gauge, determine, measure, judge, and estimate. Each of these synonyms suggests a slightly different angle on the process of sizing up, whether it be a more formal or professional methodology (as with appraise and estimate), a careful and meticulous approach (as with scrutinize and evaluate), or a more intuitive or subjective evaluation (as with judge and determine). Depending on the context, different synonyms for sizing up can help to convey a more nuanced or accurate sense of the process of assessment or evaluation.