'demystify' originates from the prefix 'de-' meaning 'remove' and the word 'mystify' which comes from the Greek word 'mystikos' meaning 'secret'.

'mystify' changed from the French word 'mystifier' and eventually became the modern English word 'mystify'.

Initially, it meant 'to make something secret or mysterious', but over time it evolved into its current meaning of 'to make something clear or understandable'.