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Phrase(s): Prevention is better than cure.
Prov. It is better to try to keep a bad thing from happening than it is to fix the bad thing once it has happened. (See also An ounce of prevention is better than a pound of cure.) • If we spend more money on education, so that children learn to be responsible citizens, we won’t have to spend so much money on prisons. Prevention is better than cure.
McGrawhill's American Idioms And Phrasal Verbs