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1. Oxford Dictionary

   sharpen

   • IPA[ˈʃɑːp(ə)n]

   英式

   • v.
     make or become sharp or sharper；improve or cause to improve

   • verb: sharpen, 3rd person present: sharpens, gerund or present participle: sharpening, past tense: sharpened, past participle: sharpened

2. • 釋義

   v.

   動詞

   • 1. make or become sharp or sharper she sharpened her pencil her tone sharpened 同義詞 make sharp/sharper, hone, whet, strop, grind, ... 更多file, rareedge, acuminate反義詞 blunt
   • 2. improve or cause to improve they've got to sharpen up in front of the goal students will sharpen up their reading skills 同義詞 improve, brush up, polish up, better, enhance, ... 更多hone, refine, fine-tune, perfect
   • 3. British raise the pitch of (a note) by a semitone.
3. • 更多解釋

   sharpen

   • IPA[ˈSHärp(ə)n]

   美式

   • v.
     make or become sharp or sharper: she sharpened her pencil her tone sharpened

   Oxford American Dictionary