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1. Literally, riding on or in a ship, train, airplane, etc. With all passengers on board, the station master blew the whistle and the train left the station.
2. In agreement with; ready or willing to participate. Is everyone on board with the new plan? Then let's get to work!
3. Employed or working with. We have a new engineer on board who specializes in repairing these kinds of computers. Welcome to the company, Dan—it's great to have you on board.
1. Lit. aboard (on or in) a ship, bus, airplane, etc. Is there a doctor on board? We have a sick passenger. When everyone is on board, we will leave.
2. Fig. employed by someone; working with someone. Our company has a computer specialist on board to advise us about the latest technology. Welcome to the company, Tom. We're all glad you're on board now.
Joining in or participating, as in The department head addressed the new employees, saying "Welcome on board," or The opera company has a new vocal coach on board to help the soloists. This expression alludes to being on or in a vessel, airplane, or other vehicle. [Colloquial; second half of 1900s]
on boardas a member of a team or group. informal
On board literally means on or in a ship, aircraft, or other vehicle, or (of a jockey) riding a horse.
on ˈboardon or in a ship, an aircraft or a train: Have the passengers gone on board yet? ♢ (figurative) It’s good to have you on board (= working with us) for this project.
2. Ready to participate or be included; amenable: The entire class was on board for the excursion to the park.