
die Achse
axle
A rod or shaft in technology around which wheels turn, or that connects wheels to each other.
Nach dem Unfall war die vordere Achse des Wagens gebrochen.
After the accident, the car's front axle was broken.
axis / axle
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axle
A rod or shaft in technology around which wheels turn, or that connects wheels to each other.
Nach dem Unfall war die vordere Achse des Wagens gebrochen.
After the accident, the car's front axle was broken.

axis
An imaginary straight line that serves as a reference line in geometry, physics, or for symmetries.
In einem Koordinatensystem schneiden sich die x-Achse und die y-Achse im Nullpunkt.
In a coordinate system, the x-axis and the y-axis intersect at the origin.

axis
A political or military alliance between two or more states.
Die politische Achse zwischen den beiden Hauptstädten hat sich in den letzten Jahren gefestigt.
The political axis between the two capitals has strengthened in recent years.
You can recognize the meaning of 'Achse' (axis/axle) from the context. In technical contexts (car, bicycle), it means the shaft for wheels. In geometry or physics, it is a reference line. In politics, it describes an alliance.
Die hintere Achse des LKW muss repariert werden.
The truck's rear axle needs to be repaired.
The colloquial expression 'auf Achse sein' means that someone is on the road a lot or traveling.
Als Vertreter ist er die ganze Woche auf Achse.
As a sales representative, he is on the road all week.
In technical contexts, 'Achse' (axle) is often combined with adjectives like 'vordere' (front), 'hintere' (rear), or 'gebrochene' (broken). People also speak of the 'Achse eines Wagens' (axle of a car) or 'eines Anhängers' (of a trailer).
Bei dem alten Fahrrad ist die vordere Achse verbogen.
The front axle on the old bicycle is bent.
The phrase 'sich um die eigene Achse drehen' is a very common expression and means that something or someone turns in a circle.
Die Tänzerin konnte sich zehnmal schnell um die eigene Achse drehen.
The dancer was able to spin around her own axis ten times quickly.
In political contexts, people often speak of a 'politische Achse' (political axis) or an 'Achse zwischen' (axis between) two cities or countries. Common verbs are 'bilden' (to form) or 'stärken' (to strengthen).
Die beiden Länder wollen eine wirtschaftliche Achse bilden.
The two countries want to form an economic axis.
line
A Linie can be a visible straight connection or mark. An Achse, by contrast, is an imaginary straight reference line used, for example, to orient coordinates or indicate symmetry. Use „Linie“ for the drawn mark and „Achse“ when the line serves this kind of orienting function.

Die Punkte liegen symmetrisch zur senkrechten Achse.
The points are symmetrical about the vertical axis.
Zeichne eine gerade Linie durch die beiden markierten Punkte.
Draw a straight line through the two marked points.