Definition of to size up in English English dictionary
To evaluate; to estimate or anticipate the magnitude, difficulty, or strength of something
Before we can begin to size up the problem, we'll need more information.
If you size up a person or situation, you carefully look at the person or think about the situation, so that you can decide how to act. Some US manufacturers have been sizing up the UK as a possible market for their clothes He spent the evening sizing me up intellectually
{f} assess; try to figure out; check something out in order to make a judgment about it
to look at critically or searchingly, or in minute detail; "he scrutinized his likeness in the mirror