[in-bawrd-out-bawrd, in-bohrd-out-bohrd] 
| 1. | Also, outdrive, stern-drive. (of a motorboat) having an inboard engine connected to a maneuverable outboard drive-shaft unit. |
| 2. | an inboard-outboard motor. |
| 3. | a boat equipped with such a motor. Abbreviation: I/O |