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English definition of “off-key”

off-key

adverb uk   /ˌɒfˈkiː/ us    /ˌɑːf-/
If you sing or play music off-key, you produce notes that are slightly higher or lower than they should be.Notes of the musical scale
(Definition of off-key from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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