[ in-shoor, -shur ]
See synonyms for insure on
verb (used with object),in·sured, in·sur·ing.
  1. to guarantee against loss or harm.

  2. to secure indemnity to or on, in case of loss, damage, or death.

  1. to issue or procure an insurance policy on or for.

verb (used without object),in·sured, in·sur·ing.
  1. to issue or procure an insurance policy.

Origin of insure

1400–50; late Middle English; variant of ensure

Other words for insure

Other words from insure

  • o·ver·in·sure, verb (used with object), o·ver·in·sured, o·ver·in·sur·ing.
  • pre·in·sure, verb (used with object), pre·in·sured, pre·in·sur·ing. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use insure in a sentence

British Dictionary definitions for insure


/ (ɪnˈʃʊə, -ˈʃɔː) /

  1. (often foll by against) to guarantee or protect (against risk, loss, etc): we insured against disappointment by making an early reservation

  2. (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

  1. another word (esp US) for ensure (def. 1), ensure (def. 2)

  • Also (rare) (for senses 1, 2): ensure

Derived forms of insure

  • 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