1) In coal-mining vocabulary this was used as a verb, meaning to scour a water channel or clear the sludge from it.

1693 paid for gate sludgeing 6d, Farnley

1765 2 days sludging the water gate, Tong. In 1702, colliers in Colsterdale had to clear the level of sludge at their expense.

dates 1693 1702 1765

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