Is there any difference between "keep in touch" and " keep the lines of communication open"?


"Keep in touch" is much more informal, and possibly would sound more friendly.

"Keep the lines of communication open" is very formal sounding, and almost aloof. It is a more of a command, as compared to "Keep in touch", which is a friendly way of saying you would like to communicate more with that person.

Not the answer you're looking for? Browse other questions tagged or ask your own question.