| 1. | Machinery.
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| 2. | Nautical.
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| 3. | a washer or packing for sealing joints between sections of pipe. |
| 4. | Military. a stiff ring of rubber or metal inside the top of a service cap, designed to keep the top of the cap stretched flat. |
| 5. | a metal-bound eyelet in cloth, sometimes used decoratively, as on a garment. |
| 6. | to fasten with a grommet. |