1. [n]  a congenital anomaly in which the mucous membrane under the tongue is too short limiting the mobility of the tongue
2. [v]  deprive of speech; "When he met his idol, the young man was tongue-tied"

TONGUE-TIE is a 10 letter word that starts with T.

1. \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.
   
   

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