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off-key

adverb
 
 
/ˌɒfˈkiː/ US  /ˌɑːf-/

Definition

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 adverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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