Learner's definition of SCRUM
a way of starting play again in which players from each team come together and try to get control of the ball by pushing against each other and using their feet when the ball is thrown in between them
the group of players who are involved in a scrum
a large group of people who are close together in one place
He pushed through the scrum [=crowd, throng] of holiday shoppers.
The actress was caught in a media scrum. [=a crowd of reporters, photographers, etc.]