c. 1400, robous, from Anglo-French rubouses (late 14c.), of unknown origin. No apparent cognates in Old French; apparently somehow related to rubble (see OED). Spelling with -ish is from late 15c. The verb sense of "disparage, criticize harshly" is first attested 1953 in Australian and New Zealand slang. Related: Rubbished; rubbishing.
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