Other forms: insured, insuring, insures
To insure something is to arrange payment in advance against a possible loss. You pay a little each month so that a disaster does not ruin you.
You insure a car, a house or a phone; you insure it against fire or theft; and you insure it for an amount. The company is the insurer, the contract is a policy, and the payment is a premium. Keep it clear of ensure, which means to make certain, and of assure, which is what you do to a worried person. British English confuses matters further by using assurance for life cover.
1verbinsureTo arrange financial protection against loss or damage.
“The van is insured for business use.”
Insure and ensure are one word split in two. Both descend from Anglo-Norman enseurer, to make sure, and insure took on the narrower business of making safe against loss by premiums in 1635.
Anglo-Norman
enseurer
Middle English
ensuren
English, today
insure
Built from
c, as a variant of Middle English ensuren (from Anglo-Norman enseurer, itself from Old French - en- + seür, probably influenced by asseürer (“to assure”)); took on its particular sense of "make safe against loss by payment of premiums" in 1635, replacing assure. a doublet of ensure.
Etymology from Wiktionary, CC BY-SA