To start, begin.
To cause to go on board a vessel or boat; to put on shipboard.
To get on a boat or ship or (outside the USA) an aeroplane.
To engage, enlist, or invest (as persons, money, etc.) in any affair.
To start an activity with the intention of finishing it.
To explain something, or give exact details, usually in writing.
To go out, leave.
To position, to put in a position