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But surely "Argh" is the sound of a sort of strangulated scream. "Aargh" is the sound of a stabbing, or a falling off a cliff. "Arr" is, I think, the noise you're looking for. It's the noise pirates make when they don't have anything better to do. "Arr, Jim Lad" = Pirate noise. "Aargh, Jim Lad" = sound of pirate falling off a cliff.
