"Strong deterrent" means something that prevents or discourages someone from doing something, usually by threatening severe consequences or punishment. Full definition
The adversarial flip side can be a very strong deterrent and motivating force that drives the mediation process, but only if the mediators can fairly protect the interests of both parties. (divorcesource.com)
Being under FTC order is a pretty strong deterrent for most companies. (canadianbusiness.com)
The fear of getting caught red - handed is a pretty strong deterrent for most people, but 74 % of men say they'd step out on their partners if they knew they'd be able to get away with it. (creditdonkey.com)