The Scots Language Centre tells us – Flit (v.): to remove (one’s household, etc.) to another house, go elsewhere. Originating from an Old Norse verb flytja, it is found in Scots sources from the Middle Ages onwards. It can also be found in the Ulster-Scots language as both a noun and a verb.
Twice in the past couple of weeks, I have heard the word used in blogs that I follow. Occurrences like that tend to tickle my interest so I was intrigued and began looking out all my dictionaries and checking online. The two blogs that mention the word are Kate Davies Design and Writing from Scotland.