pile-up vs ruck

pile-up

noun
  • A pile of tackling players. 

  • An accumulation that occurs over time, especially one which is not welcome. 

  • A pile of crashed vehicles due to a traffic accident. 

ruck

noun
  • The situation formed when a player carrying the ball is brought to the ground and one or more members of each side are engaged above the ball, trying to win possession of it; a loose scrum. 

  • A contest in games in which the ball is thrown or bounced in the air and two players from opposing teams attempt to give their team an advantage, typically by tapping the ball to a teammate. 

  • Any one of a ruckman, a ruck rover or a rover; a follower. 

  • The common mass of people or things; the ordinary ranks. 

  • A small heifer. 

  • An argument or fight. 

  • A player who competes in said contests; a ruckman or ruckwoman. 

  • A rucksack; a large backpack. 

  • A throng or crowd of people or things; a mass, a pack. 

  • A crease, a wrinkle, a pucker, as on fabric. 

verb
  • To become folded. 

  • To contest the possession of the ball in a ruck. 

  • To carry a backpack while hiking or marching. 

  • To crease or fold. 

How often have the words pile-up and ruck occurred in a corpus of books? (source: Google Ngram Viewer )