Meaning of move the chains | Babel Free

Definitions

1. To alter the position of the device, a chain holding two sticks ten yards apart, used to initially determine the position of the line crossing which yields a first down for the offense, which may be moved by penalties or by the offense gaining a first down.
2. To convert a play that would result in said chains being moved.
   broadly
3. To advance toward a goal.
   figuratively

CEFR level