if two people are at cross-purposes, they do not understand each other because they are trying to do or say different things but they do not know this.

I think we're talking at cross-purposes here. You mean the old building, but I was talking about the new one.

• you might as well
• you might as well do something
• You must be joking!
• you name it
• you never can tell
• young blood
• you owe it to to
• you owe it to to do something
• you owe it to yourself to
• you owe it to yourself to do something
• You pays your money .
• You pays your money and you takes your chances.
• You pays your money and you takes your choice.
• your alma mater
• your ass off
• your best bib and tucker
• your blood run cold
• your brains out
• your bread and butter
• You're a fine one to talk!
• You reap what you sow.
• your ears must be burning
• You're breaking my heart!
• You're in there!
• You're joking!