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A symbol ([doubleflat]) placed before a note to indicate that it is to be lowered by two semitones.
(Music, other) music
a. an accidental that lowers the pitch of the following note two semitones. Usual symbol: ♭
b. a note affected by this accidental
(Music, other) (postpositive) denoting a note of a given letter name lowered in pitch by two semitones
a symbol that lowers the pitch of the note following it by two semitones.