walk the plank

/W AO1 K DH AH0 P L AE0 NG K/
verb
  1. 1

    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.

  2. 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.

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Source: https://en.wiktionary.org/wiki/walk%20the%20plank