'deter' originates from Latin, specifically the word 'deterrere,' where 'de-' meant 'away' and 'terrere' meant 'frighten.'

'deterrere' transformed into the French word 'déterrer,' and eventually became the modern English word 'deter' through Middle English.

Initially, it meant 'to frighten away,' but over time it evolved into its current meaning of 'to discourage or prevent from taking action.'