double-stopping 
noun [mass noun]
The sounding of two strings at once on a violin or similar bowed instrument.Every technical trick in the repertoire of the virtuoso string player was on display: double-stopping, flying spiccato, glissandi, glissandi harmonics, rapid string crossing arpeggios and more....
- This is an excellent performance though, with soaring lines and some impressive double-stopping, especially in the Kochanski cadenza, and Daniel Harding and the LSO draw lots of detail from the vivid, colourful score.
- He makes his oboe seem capable of double-stopping; the separate, aquatic or breathing voices of Narcissus are so well defined and independent [listen - track 5, 0: 00-1: 25].
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