'slaughterer' originates from Old English, specifically the word 'sleaht,' where 'sleaht' meant 'killing or slaying.'

'sleaht' transformed into the Middle English word 'slaughter,' and eventually became the modern English word 'slaughterer.'

Initially, it meant 'to kill or slay,' but over time it evolved into its current meaning of 'a person who kills animals for food or in a brutal manner.'