Make sure the post is 'square' to the floor. [=make sure that there is a right angle where the post and the floor meet]
I'll go on the trip if I can 'square it with' my parents. [=if my parents will agree to let me go]
Here's the rest of the money. Now we're 'square'. [=now we don't owe each other anything]
(..) Hold on, say that again! CDO A, has parts of CDO B And CDO B, has parts of CDO A and then they both get put inside CDO C. Yeah and that one is called CDO square! A CDO of a CDO! Right? And then there's CDO's made up of the opposite sides of the bet you made with the swaps (..)2015 The Big Short