I lived abroad between the ages of 12-17 and due to regular "Could you repeat that?"s, my otherwise broad accent became more posh so that I was understood more easily.
Now people usually still know that I'm from Newcastle, UK, but often comment that my Geordie accent isn't particularly strong.
I'm sure there's a two-word phrase to describe this phenomenon, but I can't put my finger on it. I recall the phrase being armed-force-related since this might often happen to families posted abroad. Something similar to "army accent", but that doesn't sound quite right to me.
What is the short phrase meaning "an accent that has become less pronounced due to living abroad" please?