The Grow command allows for elements an islands to be expanded or shrunk along both axes. This is similar to the offset but will extend or shrink the elements as they are offset.
in the Toolbar, or type GROW in the program.
Next you will be prompted for the Orientation, this lets you choose whether the offset lines will extend as per the Extend command or use Arcs. Then you will be asked if you want to grow as a copy, leaving the original part in place (Yes) or making it bigger. (No)