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Use "spumescent" in a sentence
"The conservatory was also a terrific place to hide from her mother; with a book and an apple, Pagan would slither like a lizard under jade fronds and jagged malachite spikes, concealed by yellow froth and spumescent greens."
"She's always understood that it would be business madness for the Firm to devalue its products - pomp, circumstance, the rarefied and spumescent iconography of nationalism - by trading on the political bourse."