Makes someone feel unhappy, angry, or worried; or knocks something over so it falls.
From 'up' and 'set'—literally to set upward or knock over. The emotional meaning evolved from the physical idea of something being knocked out of its proper place or balance.
The word 'upset' shows how physical and emotional language overlap—when you're upset emotionally, your body literally feels out of balance, and in sports, an 'upset' is when the expected order gets knocked upside down.
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