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Fulling, also known as tucking or walking (spelled waulking in Scotland), is a step in woollen clothmaking which involves the cleansing of cloth (particularly wool) to eliminate oils, dirt, and other impurities, and to make it thicker. The worker who does the job is a fuller, tucker, or walker, all of which have become common surnames. The Welsh word for a fulling mill is pandy, which appears in many place-names, for example Tonypandy ("fulling mill lea").