effervesce
/ˌɛfəˈvɛs
/verb [no object]
1(Of a liquid) give off bubbles: the waves seemed to effervesce as they swept by...
- You'll remember the sort of thing - drop something volatile in a beaker of acid and watch it whiz round and round, effervescing violently and smelling of bad eggs.
2Be vivacious and enthusiastic: managers are supposed to effervesce with praise and encouragement
Origin
Early 18th century: from Latin effervescere, from ex- 'out, up' + fervescere 'begin to boil' (from fervere 'be hot, boil').