Pinking Shears Sharpening

pinking shears
Pinking shears are scissors, the blades of which are sawtoothed instead of straight. Pinking shears leave a zigzag pattern instead of a straight edge.
A pair of scissors with zigzag cutting edges, used to cut fabric: the zigzag edge helps keep the fabric from fraying
Shears with a V shape along the cutting edge used to cut fabric and have it remain essentially ravel-free.
Shears with a serrated blade, used to cut a zigzag edge in fabric to prevent it from fraying

sharpening
Improve or cause to improve
(sharpen) make crisp or more crisp and precise; "We had to sharpen our arguments"
(sharpen) raise the pitch of (musical notes)
Make or become sharp
(sharpen) focus: put (an image) into focus; "Please focus the image; we cannot enjoy the movie"