insure

动词 insure:

1. be careful or certain to do something; make certain of something
   同义词：see, check, see to it, ensure, control, ascertain, assure
2. make certain of
   同义词：guarantee, ensure, assure, secure
3. protect by insurance
   同义词：cover, underwrite
4. take out insurance for

1. `Did you insure the jewels before they were stolen?' `No, more's the pity!'
   ｀你那些被窃的珠宝买保险了吗?＇｀没有，真倒霉!＇
2. His talent and dedication will insure his success.
   他的才气和执着将确保他成功。
3. I want to insure my residence.
   我要为自己的住宅保险。
4. I am insured for all risks.
   我给自己保了综合险。
5. My house is insured against fire.
   我的房子保了火险。

in.sure

v.（动词）
in.sured,in.sur.ing,in.sures
v.tr.（及物动词）
To cover with insurance.
为…保险
To make sure, certain, or secure.See Usage Note at assure
保证，肯定或确定参见 assure
v.intr.（不及物动词）
To buy or sell insurance.
买卖或卖保险

来源：
Middle English ensuren [to assure]
中古英语 ensuren [肯定]
from Old French enseurer
源自 古法语 enseurer
possibly variant of assurer * see assure
可能为 assurer的变体 *参见 assure

【引伸】
insur.abil.ity
n.（名词）
insur.able
adj.（形容词）