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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. |
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