Noah Webster's Dictionary (p. pr. & vb. n.) of Sharpen.

Multi-Version Concordance Sharpening (1 Occurrence) 1 Samuel 13:21 and it happen, when he hears the words of this curse, that he bless himself in his heart, saying, "I shall have peace, though I walk in the stubbornness of my heart, to destroy the moist with the dry." (See RSV NIV)