Dic: get down to brass tacks

• Let's get down to brass tacks. Who's paying for all of this?
• Let's get down to brass tacks. We've wasted too much time chatting.
• Don't you think that it's about time to get down to brass tacks?

1. to start talking about the most important or basic facts of a situation
   
   Usage notes: Brass tacks is Cockney(=런던 토박이) rhyming slang (= an informal kind of language said to be used in parts of London) for facts.
   
   
2. Fig. to begin to talk about important things; to get down to business

... Cambridge Idioms, McGraw-Hill American Idioms,
http://idioms.thefreedictionary.com/brass