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Adverb: on board
  1. On a ship, train, plane or other vehicle
    - aboard

Encyclopedia: On board

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on a roll
on account of
on air
on all fours
on an individual basis
on an irregular basis
on and off
on approval
on average
on base
on board
on call
on camera
on cloud nine
on demand
on earth
on edge
on end
on faith
on fire
on guard