Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Origin: Probably from ensure

insure

verb
     
Related topics: Insurance
in‧sure
1 [intransitive and transitive]BFI to buy insurance so that you will receive money if something bad happens to you, your family, your possessions etc:
Have you insured the contents of your home?
insure (something/somebody) against loss/damage/theft/sickness etc
It is wise to insure your property against storm damage.
insure something for £1000/$2000 etc
You should insure the painting for at least £100,000.
2 [transitive]BFI to provide insurance for something or someone:
Many companies won't insure young drivers.
3x-ref an American spelling of ensure

insure (yourself) against something

phrasal verb
to protect yourself against the risk of something bad happening by planning or preparing:
Take advice to insure yourself against being misled.

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