what is "sharpening"

Terms with 'sharpen' at beginning (3):
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Terms with 'sharpen' included (2):
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Meaning of "sharpening" (0):

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    Flop to come up with the expression "sharpening" in meanings, yet looking for "sharpening" as well as analogous locutions the list at the top could be disclosed.
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Furthermore exploration for definition, synonyms and antonyms of "sharpening", connected together with inverse examinations of "sharpening" were done.

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