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nutty slack - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

A pile of nutty slack at the National Railway Museum in York, Yorkshire, England, United Kingdom.

From nutty (containing nuts) +‎ slack.

nutty slack (uncountable)

  1. (British, historical) A cheap fuel consisting of slack (coal dust) and nuts (small lumps of coal); unlike other solid fuels it was not rationed during the period after World War II.