landmark case
caso histórico
a court case, usually decided by the Supreme Court, that sets an important precedent and changes how the law is understood.
Example
Miranda v. Arizona (1966) is a landmark case: police must tell suspects they have the right to remain silent.
In Spanish
caso histórico — un caso judicial, por lo general decidido por la Corte Suprema, que sienta un precedente importante y cambia la forma de entender la ley.
Miranda v. Arizona (1966) es un caso histórico: la policía debe decirles a los sospechosos que tienen derecho a guardar silencio.