If you are doing it to something such as laying a row of tiles, laying a piece of carpet or laying an egg (!) then you are “laying”.
If you are sunbathing, reclining in bed or even, like Elinor Glyn on a tiger skin, you are lying ( no, not accusing you of telling porky pies!)
£34.7 Million For A Tyrannosaurus Rex Skeleton...
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