Possible Results:
estaba borboteando
-I was bubbling
Imperfect progressiveyoconjugation ofborbotear.
Imperfect progressiveél/ella/ustedconjugation ofborbotear.

borbotear

Estaba borboteando, listo para liberarse; un millar de arañas sombrías habían estado creciendo y ahora mordían los capullos de seda que las envolvían.
It was bubbling up, ready to release; a thousand shadowy spiders had been growing and now were chewing through their silken egg casings.
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