To bubble or fizz, either physically (as in carbonated drinks) or figuratively (as in showing lively excitement).
Third-person singular present tense of effervesce, from Latin effervescere (to boil up, ferment). The verb entered English in the 17th century as scientific understanding of gases improved.
The same word describes both champagne bubbling in a glass AND a child's excitement bubbling over—language lets us see the metaphorical connection between physical and emotional effervescence!
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