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Webster 1913 Edition

Noun.

(Mus.)

A peculiar action of the tongue by flute players in articulating staccato notes; also, the rapid repetition of notes in cornet playing.

double-tonguing ‎(countable and uncountable, plural double-tonguings)

(music) A peculiar action of the tongue by flute players in articulating staccato notes.
(music) The rapid repetition of notes in cornet playing.