This is the 123rd most frequent Danish word.
brug
"Brug" means "use" or "usage" in English.
Here, "brug" means 'need' and is used in the phrase 'have brug for', indicating necessity.
Jeg har brug for hjælp.
I need help.
In this sentence, "bruger" is the conjugated form of 'at bruge', meaning 'to use'.
Hvordan bruger du denne maskine?
How do you use this machine?
"Brugt" is the past participle of 'at bruge', thus meaning 'used' or 'spent' in this context.