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12-1-04 Assure/Ensure/Insure
“Insure” is rarely misused. Writers understand that to insure something is to “guarantee against loss or harm” (Random House Webster's College Dictionary). To insure something or someone entails a financial transaction.
With that out of the way, let's look at what is perhaps the most misused term in writing today: “assure.” We assure people to make them feel better. We assure Mary and Ted that little Clive is doing well in school. We assure Alice that those jeans don't make her butt look big. We assure Rodney that no one will notice the fish eye in the new paint on his '49 Merc.
So far so good. Trouble flares when we use “assure” when we should use “ensure.” We ensure outcomes or conditions. Periodically checking the air pressure of our spare tire will ensure (not assure) that it's useable should we ever need it. Increasing activity while cutting calories will ensure (not assure) weight loss. Wise planning and disciplined investing will ensure (not assure) a comfortable retirement.
What mnemonic device will help us? Remember that we assure people and ensure results. Remember, too, that “assure” and “reassure” are close cousins. If “reassure” makes sense in the sentence, then “assure” is probably the right choice:
Joe assured Tom that the client was pleased.
Joe reassured Tom that the client was pleased. [The sentence still makes sense.]
Dave ensured the building's security by adding an alarm system.
Dave reassured the building's security by adding an alarm system. [The sentence is now nonsensical.]
We admit that this is a gray area that's becoming grayer. Our trusty Random House even offers “assure: 3) to make (a future event) sure; ensure; guarantee.” Likewise, that dictionary gives us “ensure: 1) to secure or guarantee.” Nonetheless, we resist the movement to make these terms synonymous and we encourage others to join us in our resistance.
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