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English definition of “upgrade”

upgrade

verb [T]     /ʌpˈɡreɪd/
B2 to improve the quality or usefulness of something, such as a machine or a computer program, or give a person a more important job or state that their job is more important than it was in the past: It's quite simple to upgrade the indexing software. Congratulations, I hear you've been upgraded to divisional manager. → Opposite downgradeMaking things betterBecoming better
(Definition of upgrade verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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