British spelling: to reveal, make manifest, or cause to have an epiphany; to make something appear or become clear.
From epiphany + -ise (British verbal suffix), following the pattern of British English verbalizations. This is the British variant of the American 'epiphanize,' derived from Greek epiphaneia.
British English loves the -ise ending, so 'epiphanise' is just the UK's way of turning a revelation into an action verb—very orderly and systematic!
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