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Text from wiktionary, removed text in bold (contentious in italic): "a padded, weighty device against which a pack of rugby footballforwards can practice scrummaging, and rucking. There are wide variations in design and complexity, from padded frames, to steam roller type machines.It is used by players of both rugby league and rugby union. "
Interesting fact: In the early 1990s, after the breakup of the USSR, Georgian rugby enthusiasts, lacking money turned old Soviet tractors into bespoke scrum machines. Needs reference, but info on various websites about this.