walk the plank

verb2

1. •
   (historical) On an early naval vessel or pirate ship: to be forced to walk off the end of a gangplank (a plank of wood extending outwards from the side of the vessel) and plunge into the ocean and drown, used as a method of killing.

   • [I]t is quite a painful reflection how many whole crews we have made to walk the plank for no more than a stock of biscuit or an anker or two of spirit. — 1889
2. •
   To be forced to resign from a position in an organization.

   • After he was caught selling company secrets, it’s not surprising they made him walk the plank.