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OAKUM	Stuff made by picking rope-yarns to pieces. Used for caulking, and other purposes.
OAR	A long wooden instrument with a flat blade at one end, used for propelling boats.
OFF-AND-ON	To stand on different tacks towards and from the land.
OFFING	Distance from the shore.
ORLOP	The lower deck of a ship of the line; or that on which the cables are stowed.
OUT-HAUL	A rope used for hauling out the clew of a boom sail.
OUT-RIGGER	A spar rigged out to windward from the tops or cross-trees, to spread the breast-backstays.
OVERHAUL	To overhaul a tackle , is to let go the fall and pull on the leading parts so as to separate the blocks. To overhaul a rope , is generally to pull a part through a block so as to make slack. To overhaul rigging , is to examine it.
OVER-RAKE	Said of heavy seas which come over a vessel's head when she is at anchor, head to the sea.