sharpen
动词 sharpen:
make sharp or sharper
make sharp or sharper
become sharp or sharper
put (an image) into focus
同义词:focus, focalize, focalise
make (images or sounds) sharp or sharper
raise the pitch of (musical notes)
give a point to
同义词:taper, point
make (one's senses) more acute
同义词:heighten