"Defensive aggression" refers to a protective or defensive response to a perceived threat or danger. It involves acting aggressively to defend oneself or others from harm. Full definition
However, as with all dogs, exceptionally close supervision is required to stop accidental harm to the dog and its afterwards developing anxiety - based defensive aggression. (notinthedoghouse.com)
One positive effect of teams that combine offensive efficiency with defensive aggression: it's pretty easy to tell where they stand. (sbnation.com)
After 14 days: Your kittens may still be shy, but should be more comfortable with you approaching them and should no longer display defensive aggression behaviors. (bestfriends.org)