gemeinsame Sache machen
Translation
to make common cause, to team up, to join forces
Examples
Die beiden Firmen machen gemeinsame Sache.
The two companies are making common cause.
Sie machten mit dem Feind gemeinsame Sache.
They joined forces with the enemy.
Grammar Patterns
gemeinsame Sache machen to make common cause Die Opposition machte gemeinsame Sache.
mit j-m gemeinsame Sache machen to make common cause with sb. Sie machten mit dem Feind gemeinsame Sache.
Similar Words
Synonyms: zusammenarbeiten, sich verbünden, kooperieren; Antonyms: konkurrieren, gegeneinander arbeiten
Etymology
Literally 'common (gemeinsame) thing/matter (Sache)'. It means to act for a shared purpose.
Memory Tips
Think of putting your 'Sachen' (things) into a 'gemeinsame' (common) pile to work on a project together.