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"On board" is a phrase that originally referred to being physically located on a ship or other vessel. "Board" in this context comes from the Old Norse word "bord," meaning "plank" or "side." Over time, the phrase expanded to include any vehicle or even an organization or project. The meaning shifted from literal physical location to figurative participation or involvement. So, while the origin lies in literal seafaring, "on board" now represents being part of something, whether it's a journey or a shared goal.
on or in a ship, aircraft, or other vehicle
trên hoặc trên tàu, máy bay hoặc phương tiện khác
một chiếc máy bay bị rơi với ba người trên máy bay
