Learner's definition of UPPER
always used before a noun
1
a : located above another or others of the same kind上面的；上层的；较高的 -
the tree's upper branches树上端的枝杈
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upper and lower front teeth上下门牙
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the upper jaw上颌
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her upper extremities/limbs [=her arms and hands]她的上肢
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the wing's upper and lower surfaces翅膀的上下面
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the ship's upper and lower decks船的上下甲板
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Who will sleep on the upper berth?谁睡上铺？
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The upper stories/floors are occupied by offices.上面几层都被办公室占用了。
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the upper layer of the Earth's crust地壳的外层
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temperatures in the mid to upper 20s*25度至30度之间的温度
b : located at or near the top顶部的；上部的 -
Write your name on the upper left-hand corner of the page.把名字写在页面左上角。
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relief of upper back pain背部上方疼痛的缓解
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exercises to improve upper body strength [=strength in the arms, shoulders, neck, and back]改善上身力量的练习
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the mountain's upper and lower slopes靠近山顶/山脚的斜坡
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the upper atmosphere外大气层
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There is no upper age limit for participation.参加者的年龄没有上限。
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He's at the upper end of the pay scale.他的工资级别最高。
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The upper two-thirds of the wall has been painted.墙上部的三分之二已经粉刷过。
2
: located toward the north北部的；偏北的 -
a restaurant in upper Manhattan上曼哈顿餐厅
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an apartment on upper Fifth Avenue第五大道北段的公寓
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the upper Great Lakes region大湖区北部
3
: above another or others in position, rank, or order（职位、级别、顺序）较高的，上层的 -
the upper echelons of society上流社会
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upper-level executives高层管理人员
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upper management高级管理层
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the upper middle class中上阶层
2 upper /ˈʌpɚ/ noun
plural uppers
plural uppers
Learner's definition of UPPER
[count]
1
: the parts of a shoe or boot above the sole鞋帮；靴面 2
informal : a drug that gives you more energy兴奋剂；安非他明
on your uppers
British, old-fashioned + informal
: having very little money手头拮据；困窘