[JohnFleabass]

1) My teacher recommended me:
OXFORD, Advanced Learner´s Dictionary New Edition, Fifth Edition

Have you got anything better?
I would like to go to university (in Austria) and i need a dictionary on that level (i dont want to buy another one in a few years so it should be on a high standard with many phrases, idioms, ...).

2) I am searching for a book with idioms. It should also contain the German translation (Redewendung).
For example:
to get one´s just deserts - seinen wohlverdienten Lohn erhalten
to pay dearly for sth. - et. teuer bezahlen
to have one`s fling - sich austoben
to miss the boat - Anschluss od. Chance verpassen
to finish off - den letzten Schliff geben
a drop in the bucket - ein Tropfen auf dem heißen Stein

I hope you understand what i mean.