\Roll"ing\, a.
1. Rotating on an axis, or moving along a surface by
   rotation; turning over and over as if on an axis or a
   pivot; as, a rolling wheel or ball.
2. Moving on wheels or rollers, or as if on wheels or
   rollers; as, a rolling chair.
3. Having gradual, rounded undulations of surface; as, a
   rolling country; rolling land. [U.S.]
{Rolling bridge}. See the Note under {Drawbridge}.
{Rolling circle of a paddle wheel}, the circle described by
   the point whose velocity equals the velocity of the ship.
   --J. Bourne.
{Rolling fire} (Mil.), a discharge of firearms by soldiers in
   line, in quick succession, and in the order in which they
   stand.
{Rolling friction}, that resistance to motion experienced by
   one body rolling upon another which arises from the
   roughness or other quality of the surfaces in contact.
{Rolling mill}, a mill furnished with heavy rolls, between
   which heated metal is passed, to form it into sheets,
   rails, etc.
{Rolling press}.
   (a) A machine for calendering cloth by pressure between
       revolving rollers.
   (b) A printing press with a roller, used in copperplate
       printing.
{Rolling stock}, or {Rolling plant}, the locomotives and
   vehicles of a railway.
{Rolling tackle} (Naut.), tackle used to steady the yards
   when the ship rolls heavily. --R. H. Dana, Jr.