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]
(..) I don't want you girls going down there. - That place is loaded with spiders. - Ew! Just relax. Okay. Stop it, Nancy. It's not funny. We've got extra square footage anyway. I'll check it out in the morning. - I wonder why it was boarded up. - I don't know. Okay, show's over. - Five minutes. (..)2013 The Conjuring