This is easy.
“Insure” should only be used in the context of “insurance,” like car insurance, liability insurance, etc.
“Ensure” means to make certain.
Sadly, I’ve had more than my share of dealing with attorneys this past decade (don’t ask!), and I’ll never forget the time I was in this mediation lawyer’s office. His paperwork announced that he charged as much as $1600 per hour. You’d think—at $1600 an hour—that he’d be a serious guy, a guy who dotted his i’s and crossed his t’s. Well, the first thing that hit me was the fact that he’d used “insure” when he should have used “ensure,” which didn’t exactly give me a lot of confidence in his abilities, if you know what I mean.
$1600 an hour. Imagine.
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