insure against + risk
Protect against possible loss
Use against with dangers, accidents, and damage.
She insured her car against fire and theft.
Insure against or insure for?
Use insure against for risks and insure for for an amount or value. Insure by is not a standard complement pattern.
Quick answer
Key patterns with insure
Insure against introduces danger or loss. Insure for refers to the amount of coverage. By may appear separately to describe method or agent, not as a fixed pattern.
We insured the house against flood damage.
They insured the artwork for two million dollars.
The company is insured against theft.
They insured the artwork for two million dollars.
The company is insured against theft.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
insure for + amount
State the value of coverage
Use for before a sum of money.
The collection was insured for five hundred thousand dollars.
insure someone with + company
Name the insurance provider
With can introduce the insurer.
We insured the business with a local provider.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
insure against
They insured the factory against earthquakes.
Standard for risks and dangers.
insure for
The necklace is insured for $50,000.
Standard for coverage amount.
insure by
The property was insured by a major company.
By introduces the agent in passive voice, not a fixed complement after insure.
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using for with risks
Use against for dangers and losses.
✕ They insured the car for theft. ✓ They insured the car against theft.Using against with amounts
Use for when giving the coverage value.
✕ The house was insured against one million dollars. ✓ The house was insured for one million dollars.Treating by as the main pattern
By usually identifies the insurer in passive sentences.
✕ They insured by fire damage. ✓ They insured against fire damage.Quick practice
Choose the expression that matches the intended meaning.
1. They insured the building ___ earthquakes.
2. The painting is insured ___ $2 million.
3. The shop was insured ___ a national company.
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Frequently asked questions
What is the difference between insure against and insure for?
Against refers to the risk, while for refers to the amount insured.
Is insure by correct?
Only when by introduces the insurer or method, not as the main complement.
Can insure and ensure mean the same thing?
No. Insure usually relates to insurance policies, while ensure means make certain.
Related preposition guides
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