Language Barrier - a figurative phrase used primarily to indicate the difficulties faced when people who have no language in common attempt to communicate with each other.
The first time Chris' family came to visit us in San Francisco, I remember his Mom asking if we had a flannel she could borrow. I immediately thought of this:
A strange request, but if I had a flannel shirt, by golly I was going to let her borrow it.
Little did I know she was after a wash cloth! If given a hundred guesses for what flannel meant in England, I am quite confident that wash cloth would not have been among them...