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.