cat o' nine tails (nautical) a whip having nine knotted cords, formerly used for flogging as naval punishment.
Sailor's Word-BookThe Sailor's Word-Book⛵
cat o' nine tails An instrument of punishment used on board ships in the navy; it is commonly of nine pieces of line or cord, about half a yard long, fixed upon a piece of thick rope for a handle, and having three knots on each, at small intervals, nearest one end; with this the seamen who transgress are flogged upon the bare back.
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