ruck1 / rək/ • n. a tightly packed crowd of people: Harry squeezed through the ruck to order another beer. ∎ (the ruck) the mass of ordinary people or things: education was the key to success, a way out of the ruck.ruck2 • v. [tr.] compress or move (cloth or clothing) so that it forms a number of untidy folds or creases: the baby's nightgown was rucked up to his armpits. ∎ [intr.] (of cloth or clothing) form such folds of creases: Eleanor's dress rucked up at the front.• n. a crease or wrinkle.ruck3 • n. inf. rucksack: I barely had time to repack my ruck.