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impair (verb) damage or worsen.
A lack of proper exercise impairs our health; that is our health suffers damage if we do not have proper exercise. Imbalanced diet seriously impairs our digestive system. This means that our digestive system is seriously damaged by a lack of balance among the different nutrients we take. A country's progress suffers because of corruption, so we say corruption impairs a country's progress.
- A month-long strike by the workers in the factory has impaired the business of the company and a steep fall in profits is sure to be the result.
- Work deep down in the mines and the noise of the blasts there have impaired the health and hearing of most of the miners. Most of them suffer from lung diseases, and hardness of hearing.