To assess, evaluate, or form an opinion about a situation, person, or problem by examining it carefully.
This phrase emerged in the early 20th century from the literal act of measuring or determining the size of something. It evolved metaphorically to mean making a judgment or assessment, drawing from the idea that understanding something's 'size' or scope helps you evaluate it properly.
Interestingly, this phrase shares DNA with boxing terminology, where fighters would 'size up' their opponents before a match. The expression perfectly captures how we mentally 'measure' challenges or people, much like a tailor sizing fabric before cutting.
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