outburst UK /ˈaʊ̯tˌbɜːst/US /ˈaʊ̯tˌbɝst/noun 2/ˌaʊ̯tˈbɝst/ verb 1forms 3 noun2 •An intense period of activity.The man greeted us with an outburst of invective. •A sudden, often violent expression of emotion outburst UK /ˌaʊ̯tˈbɜːst/US /ˌaʊ̯tˈbɝst/ verb1 •To burst out. formsoutbursting · outbursteth · outbursts