A coarse file used for smoothing surfaces; or a harsh, grating sound like rough sandpaper scraping.
From Old French 'raspe,' possibly from Germanic roots meaning 'to scrape.' The word applies both to the tool and to the scratchy sound it makes.
A rasp sounds terrible—it's one of those onomatopoeia words where the sound the word makes matches the actual sound the thing produces, which is why someone with a raspy voice literally sounds like a file on metal.
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