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3. floating clow (also floating clough): a name sometimes given to a contrivance for clearing away mud from channels communicating with tidal rivers (e.g. the Humber, where the local name is ‘Devil’). It resembles a broad barge, with extensible wings which act as floodgates, and retain a head of water, by which it is forced down the channel, ploughing or scraping up the mud as it goes along.