An exclamation expressing frustration, anger, or exasperation.
A modern onomatopoeia with no fixed origin; it emerged in informal English (and especially in comic books and cartoons) as a written representation of a guttural sound of annoyance. The exact spelling varies widely (aargh, argh, arrgh) because it's meant to represent an emotional sound rather than a standard word.
This interjection became famous partly through pirate culture and comic books, where writers needed to show characters expressing raw frustration—and it's one of the few 'words' in English dictionaries that's basically just a sound humans make when irritated!
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