Word parts out- + burst Pronunciation IPA (key): /ˈaʊtˌbɜː(r)st/ Audio (UK)(file) Noun Singular outburst Plural outbursts (countable) An outburst is a sudden release of strong emotion or activity. The man greeted us with an outburst of invective.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads