Definitions:
an ordered formation of players, used to restart play, in which the forwards of a team form up with arms interlocked and heads down, and push forward against a similar group from the opposing side. the ball is thrown into the scrum and the players try to gain possession of it by kicking it backwards towards their own side.

a disorderly crowd of people or things

a set of practices used in agile project management that emphasize daily communication and the flexible reassessment of plans that are carried out in short, iterative phases of work.

form or take part in a scrum