Set - The result, due to belly compression/compaction, of a bow’s inability to return to its original shape. For instance, if a bow was constructed from a bow stave with 3” of reflex and after tillering, shooting in, and unstringing, the bow then shows 1” of reflex, the bow is said to have taken 2” of set.
String follow - When an unstrung bow's limbs are bent toward the string side of the handle, either due to set or design, they are said to have string follow, or follow the string.