From prorompere (“to burst, erupt”) + -mento. <span class="searchmatch">prorompimento</span> m (plural prorompimenti) (rare) eruption, gush, burst breakout interruption...
the meaning "to break out, to burst out (in tears, shouts, etc.)". <span class="searchmatch">prorompimento</span> prorompere in Treccani.it – Vocabolario Treccani on line, Istituto dell'Enciclopedia...