from the GNU version of the Collaborative International Dictionary of English
- intransitive v. to run over the top of a vessel, as liquid when thrown into violent agitation by heat or other cause of effervescence; to be excited with ardor or passion so as to lose self-control.
- adv. See under Boil, v. i.
Sorry, no etymologies found.
Three women stood there with identical fond smiles on their faces, waiting for Roz’s effervescence to boil over as she told them all about it, but to their surprise, she did not.