The Collaborative International Dictionary of English v.0.48:

Seethe \Seethe\, v. i.
   To be a state of ebullition or violent commotion; to be hot;
   to boil. --1 Sam. ii. 13.
   [1913 Webster]

         A long Pointe, round which the Mississippi used to
         whirl, and seethe, and foam.             --G. W. Cable.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]

         Set on the great pot, and seethe pottage for the sons
         of the prophets.                         --2 Kings iv.
                                                  38.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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