definition of
sharpen

[1] #1 sharpen v. make sharp or sharper; "sharpen the knives". wn

[2] #2 sharpen v. make crisp or more crisp and precise; "We had to sharpen our arguments". wn

[3] #3 sharpen v. become sharp or sharper; "The debate sharpened". wn

[4] #4 sharpen v. [focus, focalize, focalise] put (an image) into focus; "Please focus the image; we cannot enjoy the movie". wn

[5] #5 sharpen v. make (images or sounds) sharp or sharper. wn