vierfach
fourfold
Describing four times the amount or number of something; consisting of four parts or repeated four times.
Sie erhält für die Überstunden den vierfachen Lohn.
She receives fourfold pay for the overtime.

fourfold
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fourfold
Describing four times the amount or number of something; consisting of four parts or repeated four times.
Sie erhält für die Überstunden den vierfachen Lohn.
She receives fourfold pay for the overtime.

The word consists of the number 'vier' (four) and the ending '-fach' (-fold). This ending is attached to numbers to express multiplication, for example also in 'zweifach' (twofold) or 'zehnfach' (tenfold).
Für die Bewerbung benötigen Sie das Formular in dreifacher Ausfertigung.
For the application, you need the form in triplicate.
'Vierfach' (fourfold) can stand before a noun as an adjective and is then declined. It can also be used as an adverb to describe a verb or adjective, and then it remains unchanged.
Er ist jetzt vierfacher Vater.
He is now a father of four.
Common combinations are 'in vierfacher Ausführung' (in four copies), 'der vierfache Betrag' (four times the amount), or as a description of a person, e.g. 'vierfacher Weltmeister' (four-time world champion).
Bitte reichen Sie den Antrag in vierfacher Ausführung ein.
Please submit the application in four copies.
simple / just
'einfach' and 'vierfach' are opposites when it comes to number or quantity. In that case, 'einfach' means: only once or in one copy/version. 'vierfach' means: four times, made of four parts, or in fourfold quantity. They can be confused because in everyday language 'einfach' usually means 'easy'. But next to words like 'zweifach' or 'vierfach', it is not about difficulty, but about the question: once or several times?

Nach dem Gespräch musste das Team den Bericht vierfach ausdrucken.
After the meeting, the team had to print the report in four copies.
Bitte schick mir den Vertrag nur einfach, nicht mehrmals.
Please send me the contract only once, not multiple times.