Tongu"ing (?), vb. n. (Music)
Modification of tone for a rapid staccato effect by the performer's tongue, in playing a wind instrument, as a flute. In single tonguing only one kind of stroke is used, the tongue articulating a rapid "t;" in double tonguing, two strokes, as for "t" and "k," are alternated; in triple tonguing, "t, k, t," etc.
© Webster 1913