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[in-shoo r, -shur] /ɪnˈʃʊər, -ˈʃɜr/
verb (used with object), insured, insuring.
to guarantee against loss or harm.
to secure indemnity to or on, in case of loss, damage, or death.
to issue or procure an insurance policy on or for.
ensure (defs 1–3).
verb (used without object), insured, insuring.
to issue or procure an insurance policy.
Origin of insure
late Middle English
1400-50; late Middle English; variant of ensure
Related forms
overinsure, verb (used with object), overinsured, overinsuring.
preinsure, verb (used with object), preinsured, preinsuring.
1. warrant. 4. assure. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for insure
Contemporary Examples
Historical Examples
  • Yet no resources, that we know of, insure us against this event.

  • “I should not like to insure her against doing that,” said the boatswain.

  • Fifty years' current expense to insure the empire's peace would not equal waste of one such serious conflict.

    Oswald Langdon Carson Jay Lee
  • This division of the embassy was to insure a greater chance of its being successful.

    The Giraffe Hunters Mayne Reid
  • If it should break forth into a storm, who can insure us that in its progress a part of its fury would not be spent upon us?

    The Federalist Papers Alexander Hamilton, John Jay, and James Madison
British Dictionary definitions for insure


/ɪnˈʃʊə; -ˈʃɔː/
(often foll by against) to guarantee or protect (against risk, loss, etc): we insured against disappointment by making an early reservation
(often foll by against) to issue (a person) with an insurance policy or take out an insurance policy (on): his house was heavily insured against fire, after all his car accidents the company refuses to insure him again
another word (esp US) for ensure (sense 1), ensure (sense 2)
Also (rare) (for senses 1, 2) ensure
Derived Forms
insurable, adjective
insurability, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for insure

mid-15c., insuren, spelling variant of ensuren (see ensure). Took on its particular sense of "make safe against loss by payment of premiums" from mid-17c. (replacing assure in that meaning). Related: Insured; insuring.

Online Etymology Dictionary, © 2010 Douglas Harper
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