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prevention is better than cure
One should work to stop something from happening rather than try to combat it later. Unless you want to be violently ill for days, get the flu shot now—prevention is better than cure, you know.
ounce of prevention is worth a pound of cure
Prov. If you put in a little effort to prevent a problem, you will not have to put in a lot of effort to solve the problem. Brush your teeth every day; that way you won't have to go to the dentist to have cavities filled. An ounce of prevention is worth a pound of cure. If you get in the habit of being careful with your new stereo, chances are you won't break it and have to have it fixed later. An ounce of prevention is worth a pound of cure.
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.
ounce of prevention is worth a pound of cure, an
It is easier to forestall a disaster than to deal with it. For example, The new law makes all children under twelve wear bicycle helmets-an ounce of prevention. This ancient proverb is first recorded in Latin in Henry de Bracton's De Legibus (c. 1240) and has been repeated ever since, often in shortened form.