reversal / turning back
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turning back
The act of turning around and going or driving back in the opposite direction.
Wegen des Staus war eine Umkehr auf der Autobahn die einzige Möglichkeit.
Because of the traffic jam, turning back on the highway was the only option.
reversal
A fundamental change in opinion, behavior, or a previous development; a move away from earlier principles or ways of life.
Seine Diagnose führte zu einer vollständigen Umkehr seiner ungesunden Lebensgewohnheiten.
His diagnosis led to a complete reversal of his unhealthy lifestyle habits.
inverse
In logic or mathematics, the inverse of a statement, relationship, or operation.
Die Subtraktion ist die Umkehr der Addition.
Subtraction is the inverse of addition.
'Die Umkehr' is the noun corresponding to the separable verb 'umkehren' (to turn back). The verb describes the action of turning around, while the noun names the result or the act itself.
Als er seinen Fehler bemerkte, kehrte er sofort um.
When he noticed his mistake, he turned back immediately.
You can recognize the meaning from the context. In connection with traffic (car, route), it refers to a physical change of direction. In connection with opinions, lifestyle, or politics, it refers to a fundamental change in behavior or thinking.
Wegen der Straßensperrung mussten die Fahrer eine Umkehr machen.
Because of the road closure, the drivers had to turn back.
In the literal meaning, 'Umkehr' is often combined with verbs like 'machen' (to make/do) or 'erzwingen' (to force). A typical phrase is 'jemanden zur Umkehr zwingen' (to force someone to turn back).
Das schlechte Wetter zwang die Wanderer zur Umkehr.
The bad weather forced the hikers to turn back.
In the figurative meaning, 'Umkehr' is often intensified with adjectives that describe the extent of the change. Common phrases are 'eine radikale Umkehr' (a radical reversal), 'eine völlige Umkehr' (a complete reversal), or 'eine späte Umkehr' (a late reversal).
Nach dem Herzinfarkt kam es bei ihm zu einer radikalen Umkehr seiner Essgewohnheiten.
After the heart attack, he made a radical reversal in his eating habits.
return
Umkehr refers to the moment when someone turns around and begins moving in the opposite direction. Rückkehr refers to coming back to the place they were previously at. A Rückkehr can therefore follow an Umkehr, but the words refer to different parts of the process.
Wegen des Gewitters beschlossen die Wanderer auf halbem Weg die Umkehr.
Because of the storm, the hikers decided to turn back halfway there.
Nach dem Gewitter erreichten die Wanderer bei ihrer Rückkehr wieder das Dorf.
After the storm, the hikers reached the village again on their return.
