...afilar, to grind, whet, sharpen... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...Señora Angustias with her two children, Encarnación and little Juan, hadto sharpen her wits and develop numerous talents in order to keep thefamily together...
Vicente Blasco Ibáñez Frances Douglas 「The Blood of the Arena」
...You cut a stake, sharpen it at one end, cut it about 15 inches long, about 1 inch in diameter; leave a prong about three inches long and about three inches from top to stake down trap...
A. R. (Arthur Robert) Harding 「Fox Trapping」
...I sharpen the other end for the purpose of driving it into the ground...
A. R. (Arthur Robert) Harding 「Wolf and Coyote Trapping」
...In detecting prey the tongue acts to sharpen the sense of "smell" by conveying particles to Jacobson's organs in the roof of the mouth...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...When the veins of the birch overflow in the spring,Then I sharpen my bill and make the woods ring,Till forth gushes—rewarding my tap, tap, tap!The food of us Suckers—the rich, juicy sap...
Various 「Birds Illustrated by Colour Photography, Vol II. No. 4, October, 1897」
...Cut a forked stick, one prong one inch long, the other 6 or 8 inches long; sharpen it, run your bait on this, put the stick in the back of the hole which fastens your bait...
A. R. (Arthur Robert) Harding 「Mink Trapping」
...So hard are their coats of armourthat the Gauchos sharpen their Spanish knives, which they always carry,upon them...
Royal Dixon 「The Human Side of Animals」
...A man proceededto skin one, not doubting that life was extinct,and after proceeding a little way with the operation, heleft the hut to sharpen his knife...
Various 「Natural History in Anecdote」
...The reapers form a circleround him and sharpen their scythes...
Sir James George Frazer 「The Golden Bough」
...” “Did you sharpen the ends? If you pointed them, put them in one place...
Fay-Cooper Cole 「Traditions of the Tinguian: A Study in Philippine Folk-Lore」
..."I sharpen serpents' teeth from time to time," offered Bell amiably...
Various 「Astounding Stories of Super-Science, May, 1930」
...When everything necessary was ordered, “all hands” were put on to sharpen saws and tools, and the homestead shrieked and groaned all day with harsh, discordant raspings...
Jeanie “Mrs. Aeneas” Gunn 「We of the Never-Never」
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