Sentence:  Orion hit a rabbit once; but though sore wounded it got to the bury, and, struggling in, the arrow caught the side of the hole and was drawn out. Indeed, a nail <WSD>filed</WSD> sharp is not of much avail as an arrowhead; you must have it barbed, and that was a little beyond our skill. 
Meaning of the word marked with <WSD> tags:  To smooth, grind, or cut with a file.