Source : Webster's Revised Unabridged Dictionary (1913)

Tongue-tie \Tongue"-tie`\, n. (Med.)
   Impeded motion of the tongue because of the shortness of the
   fr[ae]num, or of the adhesion of its margins to the gums.
   --Dunglison.

Tongue-tie \Tongue"-tie`\, v. t.
   To deprive of speech or the power of speech, or of distinct
   articulation.

Source : WordNet®

tongue-tie
     v : deprive of speech; "When he met his idol, the young man was
         tongue-tied"