prevention is better than cure

Từ điển Oxford Advanced Learner 8th

preˌvention is better than ˈcure idiom
(BrE) (US an ounce of preˌvention is better than a pound of ˈcure) (saying)it is better to stop sth bad from happening rather than try to deal with the problems after it has happened
Main entry: ↑prevention_idiom