walk the plank
walk the plank {v. phr.}
1. To walk off a board extended over the side of a ship and be drowned.
The pirates captured the ship and forced the crew to walk the plank.
2. {informal}
To resign from a job because someone makes you do it.
When a new owner bought the store, the manager had to walk the plank.
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Source: A Dictionary of American Idioms