upset 有多种词性
形容词： 表心烦的 + by/about/at sth或者接从句
动词：（过去式过去分词均为原型）
MAKE SB UNHAPPY 使某人生气
to make someone feel unhappy or worried
使生气；使心烦意乱
•Don’t do anything that would upset him. 别做惹他生气的事情。
CHANGE STH 改变某事
to change a plan or situation in a way that causes problems
打乱，搅乱〔计划、形势等〕
•The chemicals upset the balance of the environment. 这些化学品破坏了环境的平衡。
MAKE STH FALL 打翻某物
to push something over without intending to
打翻，弄翻
•He upset a bowl of soup. 他打翻了一碗汤。
名词
[U] worry and unhappiness caused by an unexpected problem
〔由意外之事引起的〕忧虑；烦闷；苦恼
•If you are the victim of a burglary, the emotional upset can affect you for a long time. 如果家里被盗，烦恼不安的心情会影响你很长时间。
[C] 混乱
[ C ] when a person or team defeats an opponent who is considered to be much better than them
〔体育比赛等中〕意外的结果，爆冷门
•There was a major upset when the young skater took the gold medal. 那位年轻的滑冰运动员夺得了金牌，爆了个大冷门。stomach upset 肠胃不适
an illness that affects the stomach and makes you feel sick
upsets 是upset做为可数名词（C）时的复数或者动词单三
以上来自朗文及柯林斯词典
用于一般现在时主语是第三人称单数时，upset 才需要加s。upset 的过去式和过去分词均是upset 。
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