1 [no object] : to leave a ship or airplane

• The plane’s crew members were the last ones to disembark.
• Passengers disembarked[=debarked] from the ship.

— opposite Embark

2 [+ object] : to remove (something or someone) from a ship or airplane

• They disembarked [=(more commonly) unloaded] the cargo at the dock.

— disembarkation /dɪsˌɛmˌbɑrˈkeɪʃən/ noun [noncount]