Definition of up noun from the Oxford Advanced American Dictionary

 

up

 noun
noun
NAmE//ʌp//
 
 
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Idioms increasing or improving Business confidence is on the up.
on the up and up(informal)
 
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= on the level The offer seems to be on the up and up.
ups and downs
 
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the mixture of good and bad things in life or in a particular situation or relationship Every business has its ups and downs.
See the Oxford Advanced Learner's Dictionary entry: up