Source : Webster's Revised Unabridged Dictionary (1913)

Seethe \Seethe\, v. t. [imp. {Seethed}({Sod}, obs.); p. p.
   {Seethed}, {Sodden}; p. pr. & vb. n. {Seething}.] [OE.
   sethen, AS. se['o]?an; akin to D. sieden, OHG. siodan, G.
   sieden, Icel. sj??a, Sw. sjuda, Dan. syde, Goth. saubs a
   burnt offering. Cf. {Sod}, n., {Sodden}, {Suds}.]
   To decoct or prepare for food in hot liquid; to boil; as, to
   seethe flesh. [Written also {seeth}.]

         Set on the great pot, and seethe pottage for the sons
         of the prophets.                         --2 Kings iv.
                                                  38.

Seethe \Seethe\, v. i.
   To be a state of ebullition or violent commotion; to be hot;
   to boil. --1 Sam. ii. 13.

         A long Pointe, round which the Mississippi used to
         whirl, and seethe, and foam.             --G. W. Cable.

Source : WordNet®

seethe
     v 1: be noisy with activity; "This office is buzzing with
          activity" [syn: {hum}, {buzz}]
     2: be in an agitated emotional state; "The customer was
        seething with anger" [syn: {boil}]
     3: foam as if boiling; "a seething liquid"
     4: boil vigorously; "The liquid was seething"; "The water
        rolled" [syn: {roll}]