Source : Webster's Revised Unabridged Dictionary (1913)

Squawk \Squawk\, v. i. [imp. & p. p. {Squawked}; p. pr. & vb. n.
   {Squawking}.] [See {Squeak}.]
   To utter a shrill, abrupt scream; to squeak harshly.

   {Squawking thrush} (Zo["o]l.), the missel turush; -- so
      called from its note when alarmed. [Prov. Eng.]

Squawk \Squawk\, n.
   1. Act of squawking; a harsh squeak.

   2. (Zo["o]l.) The American night heron. See under {Night}.

   {Squawk duck} (Zo["o]l.), the bimaculate duck ({Anas
      glocitans}). It has patches of reddish brown behind, and
      in front of, each eye. [Prov. Eng.]

Source : WordNet®

squawk
     n 1: the noise of squawking; "the squawk of car horns"
     2: informal terms for objecting; "I have a gripe about the
        service here" [syn: {gripe}, {kick}, {beef}, {bitch}]
     v 1: utter a harsh abrupt scream [syn: {screak}, {skreak}, {skreigh},
           {screech}]
     2: complain; "What was he hollering about?" [syn: {gripe}, {grouse},
         {crab}, {beef}, {bellyache}, {holler}]