What is BRUISED ginger please? How is it made?

This ingredient appears in many recipes, more traditional English (like ginger beer) but not exclusively but no one seems to explain how you "bruise" the ginger! There are references to "well" and softly bruised ginger so presumabmy some physical process?
Answers:
You peel the ginger piece and then using the flat of your knife you press down on it so it bruises it but doesn't break it. It gets flavour in your food without any ginger pieces.
Ginger after being beaten up by the Skipper.
Take some ginger and beat the hell out of it.
Ginger is a root, and to bruise tap it with a steak mallet, or press it under the blade of a pallette knife.