The paper with grinding on one side takes its name from the fish 'sanding', whose rough skin was used to polish wood or metal. The lunfa concept for "voracious appetite" can come from the fish, with a formidable denture according to its voracity; or the wear and tear of sandpaper compared to the wear made of food; or be a variant per lime, which may have another origin. In addition 'sanding' is an ancient way of calling bleach water. And it is also the second (as 'you' ) and third (as 'he/she' ) people in singular present indicative mode, and second (as 'you' ) person in singular imperative for the verb sanding. See verbs/sandpaper .
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