
vier
four
The cardinal number 4; the quantity between three and five.
Das Auto hat vier Räder.
The car has four wheels.
four
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four
The cardinal number 4; the quantity between three and five.
Das Auto hat vier Räder.
The car has four wheels.

in private
An idiom meaning that something is discussed only between two people, without any other listeners.
Lass uns das bitte später unter vier Augen klären.
Let’s please clear that up later in private.

on all fours
An idiom describing someone moving on their hands and knees.
Das Baby krabbelt schon auf allen vieren durch die Wohnung.
The baby is already crawling through the apartment on all fours.
The number 'vier' (four) is the basis for many other useful words. These include 'das Viertel' (a district or 1/4), 'viertens' (fourthly, as a list item), and 'viereckig' (an adjective for a shape with four corners).
Schneide den Apfel bitte in vier Viertel.
Please cut the apple into four quarters.
The idiom 'unter vier Augen' means that something is discussed confidentially between only two people. The number 'vier' (four) refers to the eyes of the two people present.
Ich möchte das Thema nach der Besprechung mit dir unter vier Augen diskutieren.
I would like to discuss the topic with you in private after the meeting.
The expression 'auf allen vieren' describes movement on hands and knees. In this expression, the form 'vieren' is the dative plural, which is a fixed part of the idiom here.
Er rutschte auf allen vieren unter dem Tisch, um sein Handy zu suchen.
He slid on all fours under the table to look for his phone.
for
“für” introduces the recipient or beneficiary of an action. “vier,” on the other hand, indicates a quantity. When listening, pay attention to whether the sentence expresses a relationship to a person or the number four.

Ich bringe vier Getränke mit.
I’m bringing four drinks.
Ich bringe für die Gäste Getränke mit.
I’m bringing drinks for the guests.