hone
verbto develop and improve something, especially a skill, over a period of time 磨炼，训练（尤指技艺） - hone something (to something)
to make a knife or other tool sharp or sharper 磨（刀）；把（刀）磨快 The knife had been honed to razor sharpness. 这把刀已经磨得锋利无比。 The hook should be honed to a needle-sharp point. 钩子应该磨得像针一样锋利。
Word OriginMiddle English: from Old English hān ‘stone’, of Germanic origin; related to Old Norse hein.