Meaning of guarantee in English
1. a promise that something will happen or will be done
2. a formal promise of a specified quality and durability of a product
This watch is still under guarantee.
3. a written promise from a company to repair or replace a product if it proves to be faulty within a particular period of time; warranty
1. promise that something will happen or will be done
I'll guarantee it.
2. provide a written promise that the product will be repaired or replaced within a particular period of time, if anything wrong with it
We guarantee the quality.