To repair something that is broken or damaged.

To make something better or improve it.

सुधारना

English Usage: He mended his ways after the incident.

Hindi Usage: उस घटना के बाद उसने अपने तरीके सुधार लिए।

The act of repairing something.

मरम्मत

English Usage: The mend of the broken chair took less time than expected.

Hindi Usage: टूटे हुए कुर्सी की मरम्मत में अपेक्षा से कम समय लगा।