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Meaning of double-tongue

dou•ble-tongue

Pronunciation: (dub'ul tung"), [key]
— -tongued, -tongu•ing.
  1. to interrupt the wind flow by moving the tongue as if pronouncing t and k alternately, esp. in playing rapid passages or staccato notes on a brass instrument. Cf. triple-tongue.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.