What does guaranteed mean?

Answer 1

Guaratee has multiple meanings. the main meaning is an assurance that something will happen. The verb form would mean to promise that something will happen A guarantee is a formal promise of assurance that something will be repaired, replaced, paid for, etc.

Answer 2

It means you're sure about something, so sure that you are prepared to pay someone if it is not true.

The word guarantee means the same as warranty, your promise of the quality or condition of what you sell, and your promise to make it right if you are wrong.