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

Sache

Substantiv

full

matter

noun

Comparative law notes

Switzerland

This is the proper translation when the context involves a file matter or the subject matter of a case or transaction.

Definitions of matter

English

a transaction or situation for which a lawyer is providing advice for a client or in which a judge is presiding

The senior partner informed his partners of a new matter on which the firm would be retained.