• vt. 确保，保证；给…保险
• vi. 确保；投保

in-,进入，使，sure,确认，保证。引申词义投保。比较ensure.

insure

insure: [15] Insure and ensure [14] are ultimately the same word. And their common ancestor started out, in fact, as a variant of assure [14]. This came via Old French asseurer from Vulgar Latin *assēcūrāre, a compound verb formed from the Latin prefix ad- ‘to’ and the adjective sēcūrus ‘safe’ (source of English secure and sure).

Anglo-Norman had a variant form, enseurer, which produced English ensure. From fairly early on this had been alternatively spelled insure (using the Latinate prefix in-), but it was not until the 17th century that this version became established in the sense ‘provide cover against loss, damage, etc’ (for which previously the more usual term had actually been assure).
=> assure, ensure, secure, sure

insure (v.)

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.

1. "One thing you can never insure against is corruption among your staff."—"Agreed."

“永远也防不胜防的就是员工内部的贪污腐败。”——“同意。”

来自柯林斯例句

2. Think carefully before you insure against accident, sickness and redundancy.

在为意外事故、疾病与失业投保之前一定要考虑清楚。

来自柯林斯例句

3. Will it insure success to [ for ] you?

这将保证你成功 吗 ?

来自《简明英汉词典》

4. Check your work to insure its accuracy.

检查一下你的工作,以保证它的准确性.

来自《简明英汉词典》

5. An insurance company will insure your life.

保险公司可以给你保寿险.

来自《简明英汉词典》