What does plunge mean?
Plunge is a forceful word for a sudden, rapid movement, especially a headlong fall into water. Its figurative uses are equally vivid: a person may plunge into an activity with enthusiasm, while prices, temperatures, or confidence may plunge through a sharp decline. The expression “take the plunge” means to make a decisive commitment after considering the risks. As a noun, a plunge can be the act of diving or falling, a sudden drop or decline, or a bold step into an unfamiliar situation. The word is common in British and American English and appears in both literal descriptions and vivid figurative language. Its associations with depth, speed, and suddenness make it especially effective for describing events that feel dramatic or consequential.
To fall or move suddenly and forcefully, especially into water or another substance; to enter a situation with enthusiasm; or to decline sharply.
"Temperatures plunged below freezing overnight."
The verb can be transitive or intransitive, and it commonly appears with “into” in figurative uses.
An act of plunging or diving; a sudden and dramatic fall or decline; or a decisive step into an unfamiliar situation.
"He took the plunge and started his own business."
The noun is countable and commonly used with “into” or “a plunge in” and in the idiom “take the plunge.”
Use the plural for separate instances of a sudden fall, decline, dive, or decisive undertaking.
"The market experienced several plunges during the year."
From a headlong dive to a stock-market crash, plunge captures the moment something falls fast—and often dramatically.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does plunge come from?
The word entered English through medieval French forms related to “plon(g)er,” ultimately deriving from Latin roots associated with plunging, dashing, or striking. In Middle English, “plunge” was used especially for falling headlong into water. Over time, its literal sense extended to sharp declines, enthusiastic involvement, and committing oneself to a difficult or unfamiliar undertaking. Related English words such as “plaintive” and “plangent” also reflect the Latin root associated with striking, lamentation, or plunging.
Related word forms
How plunge is actually used
Plunge is forceful and often suggests speed, depth, or a sudden change. It is common in both formal and informal contexts, but figurative uses can imply danger, risk, emotional intensity, or a dramatic decline.
Easily confused with plunge
A lunge is a sudden forward thrust or movement, whereas a plunge is a rapid fall or a headlong movement into something.