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What is the difference between insure and ensure, and also, assure?

Basically, insure, ensure, and assure mean to make a person or thing more sure. Insure should be restricted to providing or obtaining insurance to indemnify or guarantee someone or something against a loss. Ensure can be used in all other senses, especially 'to make certain'. Ensure can also imply a guarantee. Then there is a third word, assure, which means to make a promise or convince. Assure also implies the removal of doubt and suspense within someone's mind. Here are some examples of usage for assure, ensure, and insure: I assured him that I would not clean out his tool and hardware collection. She looked back to assure that no dogs were following her. / The government ensured the safety of the troops during the time they would be airlifted out of the country. We will ensure that the abusive coach will not return next year. / She was insured against loss in the homeowner's policy. The valuables are insured.

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