verb (used without object), ef·fer·vesced, ef·fer·vesc·ing.
- to give off bubbles of gas, as fermenting liquors.
- to issue forth in bubbles.
- to show enthusiasm, excitement, liveliness, etc.: The parents effervesced with pride over their new baby.
- (of a liquid) to give off bubbles of gas
- (of a gas) to issue in bubbles from a liquid
- to exhibit great excitement, vivacity, etc
1702, from Latin effervescere (see effervescence). Related: Effervesced; effervescing.