The German word "ach" means "alas!". But combined with other words it has lots of meanings:

Ach ja? - Really?
Ach nein? - You don't?
Ach nein! - Do tell!
Ach so! - I see!
Ach was! - Nonsense!
Ach wo! - Of course not!
Ach herrje! - Oh, dear!

I forgot one?
Ach, du Scheiße!*

(*Holy sh*t!)

Enjoy our language!

#TheGermanWord