triumphalism

noun
🔊/traɪˈʌmfəlɪzəm/
🔊/traɪˈʌmfəlɪzəm/
[uncountable] (disapproving)
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  1. behaviour that celebrates a victory or success in a way that is too proud and intended to upset the people you have defeated耀武扬威;扬扬得意Topics Successc2