Source : Webster's Revised Unabridged Dictionary (1913)

Squeak \Squeak\, v. i. [imp.& p. p. {Squaked}; p. pr. & vb. n.
   {Squeaking}.] [Probably of imitative origin; cf. Sw.
   sqv["a]ka to croak, Icel. skvakka to give a sound as of water
   shaken in a bottle.]
   1. To utter a sharp, shrill cry, usually of short duration;
      to cry with an acute tone, as an animal; or, to make a
      sharp, disagreeable noise, as a pipe or quill, a wagon
      wheel, a door; to creak.

            Who can endure to hear one of the rough old Romans
            squeaking through the mouth of an eunuch? --Addison.

            Zoilus calls the companions of Ulysses the
            ``squeaking pigs'' of Homer.          --Pope.

   2. To break silence or secrecy for fear of pain or
      punishment; to speak; to confess. [Colloq.]

Source : WordNet®

squeaking
     adj : having or making a high-pitched sound such as that made by a
           mouse or a rusty hinge [syn: {screaky}, {screechy}, {squeaky},
            {squealing}]