1.  ruck(n = noun.group) herd - a crowd especially of ordinary or undistinguished persons or things; "his brilliance raised him above the ruck"; "the children resembled a fairy herd"
is a kind of concourse, multitude, throng

2.  ruck(n = noun.shape) pucker - an irregular fold in an otherwise even surface (as in cloth); Array
is a kind of bend, crease, crimp, flexure, fold, plication
Derived form verb ruck₁

   ruck(v = verb.contact) pucker, ruck up - become wrinkled or drawn together; "her lips puckered"
is one way to crease, crinkle, crisp, ruckle, scrunch, scrunch up, wrinkle
Derived form noun ruck₂
Sample sentences: Something ----s

   A roc. Drayton. [1913 Webster]

   To draw into wrinkles or unsightly folds; to crease; as, to ruck up a carpet. Smart. [1913 Webster]

   A wrinkle or crease in a piece of cloth, or in needlework. [1913 Webster]

   To cower; to huddle together; to squat; to sit, as a hen on eggs. Gower. South. [1913 Webster]
"The sheep that rouketh in the fold." [1913 Webster]

1.  A heap; a rick. [1913 Webster]

2.  The common sort, whether persons or things; as, the ruck in a horse race. [1913 Webster]
"The ruck in society as a whole." [1913 Webster]

ruck, n.
1 (prec. by the) the main body of competitors not likely to overtake the leaders.
2 an undistinguished crowd of persons or things.
3 Rugby Football a loose scrum with the ball on the ground.
4 Austral. Rules a group of three mobile players.

ruck, v. & n.
--v.tr. & intr. (often foll. by up) make or become creased or wrinkled.
--n. a crease or wrinkle.

Etymology:
ON hrukka

N  fold, plicature, plait, pleat, ply, crease, tuck, gather, flexion, flexure, joint, elbow, double, doubling, duplicature, gather, wrinkle, rimple, crinkle, crankle, crumple, rumple, rivel, ruck, ruffle, dog's ear, corrugation, frounce, flounce, lapel, pucker, crow's feet, plication, folded, fluted, pleated.

VB  fold, double, plicate, plait, crease, wrinkle, crinkle, crankle, curl, cockle up, cocker, rimple, rumple, flute, frizzle, frounce, rivel, twill, corrugate, ruffle, crimple, crumple, pucker, turn down, double down, down under, tuck, ruck, hem, gather.

ruck up