'decider' originates from the Latin word 'decidere,' where 'de-' meant 'off' and 'caedere' meant 'to cut.'

'decidere' transformed into the Old French word 'decider,' and eventually became the modern English word 'decide,' from which 'decider' is derived.

Initially, it meant 'to cut off or determine,' and over time it evolved into its current meaning of 'a person or thing that decides something.'