http://www.nfl.com/fans/rules
Still, that appears to be a "watered down" rule book and definitions...not the "official" NFL Rule Book. I can't find a definition for "football move."
I heard the Sunday Night Football crew discussing the review of a catch and fumble. They made reference to "the receiver must have possession, control and make a football move." Could you define "a football move" as it relates to a catch? --Steve Supica, Canton, Mich.
When a catch is made by a receiver who comes down with both feet on the ground, the "football move" would be: stretching for a first down, diving out-of-bounds or running with the ball. If the "football move" is accomplished, and the receiver is then hit and the ball comes out, it is ruled a catch and fumble, instead of an incomplete forward pass.
Source:Jerry Markbreit former NFL umpire