In Italian, when somebody speaks using words that are too erudite, too formal, or too complicated for the context, we say parla come mangi (literally, speak as you eat).
What phrase should I use in English which is understood to have a similar meaning?
Imagine I ask somebody how to do something, and that person gives an answer that uses too technical words when the answer could simply be Click the red button.
Which expression could I use to mean use a simpler vocabulary?
If there is any difference between American English and British English, I am interested in hearing them.
Best Answer
When someone is trying to explain a concept and use terms that are far too technical for the average person to understand (like your excellent "click the red button" example!) they are often asked to "Speak in layman's terms". They're being asked to stop using technical jargon, and explain the concept in terms most people will understand. This is a very common expression, and I believe the one you are looking for!