Definitions:

1. A policy or approach where no behavior or action contrary to rules and regulations is overlooked or tolerated, and strict punishment is imposed for every offense. NOUN
   • The construction site has a zero tolerance policy for safety violations.
2. A strict policy or rule that allows no exceptions or leniency for certain behaviors or violations. NOUN
   • The shool enforced a zero tolerance policy on cheating.
3. Refusal to accept antisocial behavior, typically by strict and uncompromising application of the law. NOUN
   • The city has a zero tolerance policy for drunk driving.
4. The strict policy of enforcing all the laws of a state, or the rules of an institution, and allowing no toleration or compromise for first-time offenders or petty violations. NOUN
   • The sports organization has a zero tolerance policy for doping.

Synonyms:

• hardline policy
• no exceptions
• strict enforcement