To emit small bubbles of gas, as a carbonated or fermenting liquid.
To escape from a liquid as bubbles; bubble up.
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 Indo-European roots.] ef'fer·ves'cence, ef'fer·ves'cen·cy n., ef'fer·ves'cent adj., ef'fer·ves'cent·ly adv.