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]
(..) The Neapolitan won the lottery! Hey, Ciccio from Naples won the lottery! Always the northerners who hit it lucky. The square is mine! All mine! Hold still! Horseflies bothering you? You got a lice factory up here. Beat it. What're you after? A smack? (..)1988 Cinema Paradiso
(..) Thank you, Alfredo. - Good-bye. - Bye. See you. l understood right away. The square is mine! lt's my square! lt's midnight. Midnight! Out! Shoo! l have to close the square. Hard on the feet, eh, Father? (..)1988 Cinema Paradiso