plural of double flat

(music) An accidental that indicates that a note should be played a whole step higher.

(music) an accidental that indicates that a note should be played a whole step lower

plural of double-ender

(nautical) A vessel capable of moving both forwards and backwards, having bow and rudder at each end. / A locomotive with a pilot at each end.

(of a window) Having both sashes hung with weights and cords, so as to move either upward or downward.

plural of double first

(UK) A first-class degree in both classics and mathematics. / (UK) One who achieves such a degree.

Having two functional faces. / deceitful; hypocritical; treacherous

(literature) An essential duality within a single character, centred on the polarity of good and evil.