To make keen
grind, file, hone, put an edge on, grind to a fine edge, hone to a razor edge, make sharp, make acute, whet, strop, give an edge to, put a point on, give a fine point to.
Antonyms flatten*, thicken, turn.
To make more exact
focus, bring into focus, intensify, make clear, make clearer, clarify, outline distinctly, make more distinct.
Antonyms confuse*, cloud, obscure.
"sharpen." YourDictionary, n.d. Web. 05 December 2018. <https://thesaurus.yourdictionary.com/sharpen>.
sharpen. (n.d.). Retrieved December 05th, 2018, from https://thesaurus.yourdictionary.com/sharpen
To give a sharp edge to:
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