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English definition of “upper”

upper

adjective [before noun] uk   /ˈʌp.ər/ us    //
B1 at a higher position or level than something else, or being the top part of something: The office block's upper floors were being repainted. If the infection is not checked it will probably spread to the upper body.
Opposite
Up and upwardMoving upwards

upper

noun [C] uk   /ˈʌp.ər/ us    //

upper noun [C] (SHOE PART)

the top part of a shoe that covers a person's foot and to which the heel and the sole are fixed: These shoes have leather uppers and synthetic soles.Shoes and shoemaking

upper noun [C] (DRUG)

informal a drug that causes a person taking it to feel very active and excited
Opposite
Specific types of drugDrugs - general wordsSpecific medicines and drugs
(Definition of upper from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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