effervesce \ef`fervesce"\, v. i. imp.  p. p. effervesced;
   p. pr.  vb. n. effervescing. l. effervescere; ex +
   fervescere to begin boiling, incho., fr. fervere to boil. see
   fervent.
   1. to be in a state of natural ebullition; to bubble and
      hiss, as fermenting liquors, or any fluid, when some part
      escapes in a gaseous form.
      1913 webster

   2. to exhibit, in lively natural expression, feelings that
      can not be repressed or concealed; as, to effervesce with
      joy or merriment. effervescence
see also:
effervesced effervescing fervent