This is the 385th most frequent Bulgarian word.
допълнително
"Additionally" or "extra."
In this context, 'допълнително' is used as an adverb to denote that the action of working is in addition to regular work.
Той реши да работи допълнително през уикенда.
He decided to work additionally over the weekend.
'Допълнително' here functions as an adverb modifying the action of 'to give', indicating an extended explanation.
Ще дам допълнително обяснение за проекта.
I will give additional explanation about the project.
Here, 'допълнително' means 'additional' and is used as an adjective to describe the extra time requested.