A person who cuts something; one who operates a cutting tool or machine, or historically, one who makes or sells cutlery.
From 'cuttle' or 'cut' + the agent suffix '-er' (one who does). Related to 'cutler' (a cutlery dealer), with overlapping but distinct meanings.
A 'cutler' sells knives, but a 'cuttler' does the cutting—these nearly identical words show how English's '-er' suffix can spawn homophones with completely different meanings.
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