Do a moonlight/midnight flit British Verb + object/complement informal
To move slightly, suddenly and secretly from a place, especially at night, to avoid paying money that you owe
I don't have enough money to pay the rent this month, so I decide to do a moonlight flit.
If you want to do a midnight flit, I will definitely call the police.
It is used in all of the tenses.
It came from the early 19th century in northern England or Scotland.