The D-flat dominant seventh chord (abbreviated "Db7 chord") is a four-note chord consisting of the notes D♭, F, A♭, and C♭. The chord is formed by adding a minor seventh to a D-flat major chord.
D-flat dominant seventh chord
D-flat major-minor seventh chord
D♭ F A♭ C♭
1 3 5 ♭7
tetrad (four-note chord)