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]
(..) Sweet and sour chicken. What do we got? Fuck you, Mars. Johanssen, Jesus. I have created square meters of soil. You take hydrogen, you add oxygen, you burn. Nothing bad has ever happened from lighting hydrogen (..)2015 The Martian