Meanwhile, online stores have further sharpened purchase decisions and prices, leading some shoppers to come into the stores only when they can cherry pick discounted items.

become or make something better, more skilful, more effective, etc = improve
if your voice sharpens or something sharpens it, it become high and loud in an unpleasant way


「はっきりさせる」 define


Posted by at 2014年2月23日
Filed in category: S,