Agree about Slang Expressions
When a British manager asked a project team to, "go commando" in its approach to a particular issue, we in America had a bit of a chuckle. I knew him well enough that I knew he did not intend to tell the Americans to dispense with wearing underwear, as the expression would be interpreted. Because his ego would not allow an American to point out the cultural interpretation, I had to gently mention the faux paux to a British colleague who passed the information to the manager. Big grins here.