The phrase "defensive work" refers to tasks or actions carried out to protect or defend something or someone from harm, danger, or unwanted situations.
One is a group with extremely high work rates the other is a group of player with extremely high ability but low DEFENSIVE work rate. (justarsenal.com)
That requires good defensive work by the full backs and wingers. (justarsenal.com)
There is nothing wrong with forward players helping with defensive work. (therepublikofmancunia.com)