pig pile vs ruck

pig pile

noun
  • A disorderly pile of people formed by jumping upon a victim. 

verb
  • To jump into such a pile. 

  • To cause a group of people to lie in a pile upon another, originally as a punishment to the victim on the bottom. 

  • To act similarly with regard to residential density: to live or cause to live in high-density settlements. 

ruck

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

  • 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. 

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

  • A rucksack; a large backpack. 

  • 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 pig pile and ruck occurred in a corpus of books? (source: Google Ngram Viewer )