ef·fer·vesce 
(ĕf′ər-vĕs)
(ĕf′ər-vĕs)intr.v. ef·fer·vesced, ef·fer·vesc·ing, ef·fer·vesc·es
1. To emit small bubbles of gas, as a carbonated or fermenting liquid.
2. To escape from a liquid as bubbles; bubble up.
3. To show high spirits or animation.
[Latin effervēscere : ex-, up, out; see EX- + fervēscere, to start boiling, inchoative of fervēre, to boil; see bhreu- in the Appendix of Indo-European roots.]
ef′fer·vescence, ef′fer·vescen·cy n.
ef′fer·vescent adj.
ef′fer·vescent·ly adv.