plounce

A variant of plunge, perhaps influenced by flounce.

plounce (third-person singular simple present plounces, present participle plouncing, simple past and past participle plounced)

1. (rare, obsolete, regional) to plunge

• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “plounce”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.
• “plounce”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.