an attempt to prevent or discourage an action before it is taken, thus mitigating a threat
Something meant to frighten people, in order to prevent them from committing a crime.
Any physical or psychological device or method that discourages action. In the physical security arena, locks or window grills are physical deterrents and the presence of a guard or surveillance camera are psychological deterrents.
Something that prevents or restrain by fear
Substance used to prevent a cat from accessing a particular area