The phrase "walk the plank" is a popular idiom commonly used to describe a person being forced to take a long walk off of a pirate ship's plank into the ocean. However, there are many synonyms that can be used in place of this phrase. Some possible options include "take a dive," "go overboard," "meet a watery grave," "take a swim," "take a plunge," or "jump ship." These synonyms can be used in various contexts, such as in business or personal life, to describe situations where someone is forced to face consequences or make a tough decision. Regardless of the specific synonym used, the underlying meaning remains the same - someone is being forced to face a risky or unpleasant situation.