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flat

adjective, adverb (MUSIC)
 
 
/flæt/ (flatter, flattest)

Definition

(in music) lower than a particular note or the correct note: The top string on your violin is flat. She sang flat throughout the song (= all the notes she sang were too low). → Compare natural adjective, sharp adjective adverbNotes of the musical scale
(Definition of flat adjectiveadverb (MUSIC) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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