A defence reaction is a natural response to a perceived threat, danger or stressor. Synonyms for defence reaction include defensive response, protectiveness, safeguarding, shielding, securing, preservation and self-protection. A defensive response is a quick and often impulsive reaction to avoid or ward off harm, whereas protectiveness refers to a more proactive approach to ensure safety and security. Safeguarding, shielding and securing all involve taking measures to prevent harm or damage to oneself or others. Preservation suggests a protective measure to keep something in its original state, while self-protection refers specifically to actions taken to protect oneself from harm.