society > travel > travel by water > other nautical operations > [verb (transitive)] > supply with ballast > remove ballast from (3)
transitive. = unballast, v. 1. Obsolete. rare. (Cf. balance, v. 17.)
Nautical. To clear (a ship) of ballast.
transitive. To remove ballast from (esp. an oil-rig platform or barge).