get (one's) lines crossed

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get (one's) lines crossed

To have a misunderstanding or miscommunication with someone else. I'm sorry I'm late, I thought we were getting here at 8—we must have gotten our lines crossed. My mom and I got our lines crossed, and now there's no one here to babysit the kids.
See also: crosse, get, line

get your ˈlines/ˈwires crossed

,

have crossed ˈlines/ˈwires

(informal) misunderstand each other: I think we’ve got our lines crossed somewhere. I said Venice, not Vienna.We must have got crossed wires. I thought you were going to drive, not me.
This refers to telephone wires/lines that are not connected properly.
See also: crosse, get, line, wire