Thrash (chain)

From International Dictionary of Marine Aids to Navigation
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Alternative term: Chafe (chain) (USA)

That part of a mooring chain of a buoy that is constantly rubbing on the sea-bed as the buoy rises and falls.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

United States of America

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM