British spelling: to make or become inspired by Dionysian spirit, often meaning to surrender to revelry, ecstasy, or wild celebration.
From 'Dionysian' (relating to Dionysus, the Greek god of wine and ecstasy) + '-ise' (British suffix for verbs), following the pattern of verbing adjectives.
To 'dionise' is to embrace the wild, ecstatic side of human nature that Dionysus represented—it's the opposite of being controlled and rational, which is why Nietzsche used 'Dionysian' to describe the passionate, creative forces in human culture!
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