|1.||Fall off the grid|
To (seemingly) disappear from the face of the earth
Disappear to a place one would be very unlikely to be found.
What happened to Tom? I haven't talked to him since ten years ago.
Last time I heard, he got caught up in a drug-related arrest. Somehow escaped from prison and was forced to fall off the grid, probably somewhere in the Amazon Rainforest living with them Natives by now.