From Middle English robous ("rubbish, building rubble"), further origin uncertain; possibly from Anglo-Norman rubous, rubouse, rubbouse, and compare Late Latin rebbussa, robousa, robusium, robusum, rubisum, rubusa, rubusium (although the Anglo-Norman and Latin words may be derived from the English word instead of the other way around). The English word may be related to rubble, though the connection is unclear.
The verb is derived from the noun.
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