double-tongue

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To play a rapidly repeated series of notes on a wind instrument by placing the tongue alternately between the positions for t and k.

Century Dictionary and Cyclopedia

1. n. Duplicity; deceitfulness.
2. In music, in playing the flute and certain brass instruments, like the cornet, to apply the tongue rapidly to the teeth and the hard palate alternately, so as to insure a brilliant execution of a staccato passage.
3. n. A kind of dwarf butcher's-broom, Ruscus Hypoglossum, of southern Europe: so called from the appearance of the cladodes. See Ruscus.

GNU Webster's 1913

1. n. Deceit; duplicity.

WordNet 3.0

1. v. play fast notes on a wind instrument