Source : Webster's Revised Unabridged Dictionary (1913)

Sob \Sob\, n.
   1. The act of sobbing; a convulsive sigh, or inspiration of
      the breath, as in sorrow.

            Break, heart, or choke with sobs my hated breath.
                                                  --Dryden.

   2. Any sorrowful cry or sound.

            The tremulous sob of the complaining owl.
                                                  --Wordsworth.

Sob \Sob\, v. t. [See {Sop}.]
   To soak. [Obs.] --Mortimer.

Sob \Sob\, v. i. [imp. & p. p. {Sobbed}; p. pr. & vb. n.
   {Sobbing}.] [OE. sobben; akin to AS. se['o]fian, si['o]fian,
   to complain, bewail, se['o]fung, si['o]fung, sobbing,
   lamentation; cf. OHG. s?ft["o]n, s?ft?n, to sigh, MHG.
   siuften, siufzen, G. seufzen, MHG. s?ft a sigh, properly, a
   drawing in of breath, from s?fen to drink, OHG. s?fan. Cf.
   {Sup}.]
   To sigh with a sudden heaving of the breast, or with a kind
   of convulsive motion; to sigh with tears, and with a
   convulsive drawing in of the breath.

         Sobbing is the same thing [as sighing], stronger.
                                                  --Bacon.

         She sighed, she sobbed, and, furious with despair. She
         rent her garments, and she tore her hair. --Dryden.

Source : WordNet®

SOB
     n 1: a dyspneic condition [syn: {shortness of breath}, {breathlessness}]
     2: insulting terms of address for people who are stupid or
        irritating or ridiculous [syn: {asshole}, {bastard}, {cocksucker},
         {dickhead}, {shit}, {mother fucker}, {motherfucker}, {prick},
         {whoreson}, {son of a bitch}]
     3: convulsive gasp made while weeping [syn: {sobbing}]