Let’s celebrate the European Day of Languages this weekend with some language idioms:
In plain English – con lenguaje simple
I can´t understand the instructions, tell me how to do it in plain English.
Watch your language! – No uses palabrotas
Remember there are children here – please watch your language!
To speak the same language – entenderse con alguien (ideas, opiniones etc)
I get on well with Joe because we speak the same language.
You can learn more about language in B2.3 unit 5.