Source : Webster's Revised Unabridged Dictionary (1913)

Tonguing \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.

Tongue \Tongue\, v. t. [imp. & p. p. {Tongued}; p. pr. & vb. n.
   {Tonguing}.]
   1. To speak; to utter. ``Such stuff as madmen tongue.''
      --Shak.

   2. To chide; to scold.

            How might she tongue me.              --Shak.

   3. (Mus.) To modulate or modify with the tongue, as notes, in
      playing the flute and some other wind instruments.

   4. To join means of a tongue and grove; as, to tongue boards
      together.