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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.
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