- Use Lay to lay down flat on the ground.
The Lay command allows you to assume a prone posture: for instance, when you want to be flat on your belly to wiggle under something.
Certain conditions could prevent you from laying down. For instance, you could be paralyzed; or you could be fighting. As in all cases, the Game Channel will inform you of the outcome of your command.
Like all changes in posture, going prone will very likely cause your attributes to vary, particularly including dexterity and armor.
Complete command reference: