How to use
to promise to do something or to promise that something will happen
I guarantee you'll love this film.
guarantee somebody something
If you send the application form in straight away, I can guarantee you an interview.
guarantee to do something
I cannot guarantee to work for more than a year.
The law guarantees equal rights for men and women.
to make a formal written promise to repair or replace a product if it breaks within a specific period of time
All our products are
guarantee something against something
The stereo is guaranteed against failure for a year.
to promise that you will pay back money that someone else has borrowed, if they do not pay it back themselves
The bank will only lend me money if my parents guarantee the loan.
to make it certain that something will happen
In movies, talent by no means guarantees success.
The built-in thermostat guarantees that the water remains at the same temperature all the time.
be guaranteed to do something
This latest incident is guaranteed to make the situation worse.
be guaranteed something
Even if you complete your training, you aren't guaranteed a job.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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