Squealing

from WordNet (r) 3.0 (2006)

squealing
    adj 1: having or making a high-pitched sound such as that made
           by a mouse or a rusty hinge [syn: {screaky}, {screechy},
           {squeaking}, {squeaky}, {squealing}]

from The Collaborative International Dictionary of English v.0.48

Squeal \Squeal\ (skw[=e]l), v. i. [imp. & p. p. {Squealed}
   (skw[=e]ld); p. pr. & vb. n. {Squealing}.] [Of Scand. origin;
   cf. Sw. sqv[aum]la, Norw. skvella. Cf. {Squeak}, {Squall}.]
   1. To cry with a sharp, shrill, prolonged sound, as certain
      animals do, indicating want, displeasure, or pain.
      [1913 Webster]

   2. To turn informer; to betray a secret. [Slang]
      [1913 Webster]