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]
(..) PROBE: Alert. Alert. HAL: But they didn't call him Unrelenting for nothing. Ship, release new probes. I want them to map every square klick of this mud ball... ...and set charges to force that son of a cur into the open. If Bolphunga couldn't find Mogo directly, then he'd find him indirectly: (..)2011 Green Lantern: Emerald Knights