Definition

on board: inside the vehicle (plane, ship or train); cooperating, taking part idiom
I was on board the train when it crashed. I was inside the train at the time.
Baby on board Baby inside the car (sign on the back window of cars)
  • "The boat is waiting and my monkeys are already on board."
  • "12 screaming babies on board."
  • "We've got Bümbüm on board, new exotic chemicals, a new factory."
  • "By the way, is there anyone on board who knows how to fly a plane?"
  • "It may sound like an accident waiting to happen, but certain high-profile university professors are researching powering aircraft with on-board nuclear reactors."
  • "They're on board?"
  • "Desmond : Of course they're on board, Brian."

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