Simple past tense and past participle of proliferate.(verb)
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Use "proliferated" in a sentence
"The phrase proliferated in the media even after Democrats dropped the public option."
"Pahad added landmines, which "proliferated" southern Africa, were a big problem."
"An enlightening experience of this kind came to Goethe's aid when one day he happened to see a 'proliferated' rose (durchgewachsene Rose), that is, a rose from whose centre a whole new plant had sprung."