There are multiple definitions - click on the translation that matches your context.

Klage

Substantiv

partial

cause of action

noun

Comparative law notes

Germany

In the United States, the phrase "cause of action" is frequently (and informally) used synonymously with lawsuit.

Definitions of cause of action

English

the facts that give rise to (=lead to) a lawsuit or a legal claim

The judge ruled that the federal Noise Control Act did not provide the plaintiff with a cause of action to sue in a federal district court.