Sharpen Pruning Shears

pruning shears
shears with strong blades used for light pruning of woody plants
Pruning shears, also called hand pruners, or secateurs (in British English), are a type of scissors for use with plants. They are strong enough to prune hard branches of trees and shrubs, sometimes up to two centimetres thick.
used to cut branches up to ? inch in diameter.

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