Etymology
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scrum (n.)

1888, abbreviation of scrummage, a variant form of scrimmage (n.). Transferred sense of "noisy throng" is from 1950.

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Definitions of scrum

scrum (n.)
(rugby) the method of beginning play in which the forwards of each team crouch side by side with locked arms; play starts when the ball is thrown in between them and the two sides compete for possession;
Synonyms: scrummage
From wordnet.princeton.edu