underwater
adjective
un·der·wa·ter
ˌən-dər-ˈwȯ-tər 
-ˈwä-
1
: lying, growing, worn, performed, or operating below the surface of the water
underwater plants
2
: being below the waterline of a ship
3
a
: having, relating to, or being a mortgage loan for which more is owed than the property securing the loan is worth
b
: having, relating to, or being a stock option for which the price of the option is higher than the current market value of the stock
underwater
adverb
Examples of underwater in a Sentence
underwater plants don't require as much light to grow as surface plants
a vessel designed for underwater exploration
Recent Examples on the Web
The most common cause is underwater earthquakes that force the seafloor to move vertically, either rising or sinking, which displaces massive volumes of water.
—
Shane Croucher, MSNBC Newsweek, 10 Oct. 2025
The company, fittingly called Everglades Oysters, is built around a 74-acre underwater farm surrounded by the maze of mangroves that make up the 10,000 Islands National Wildlife Refuge and on the fringe of one of Florida’s most productive bull shark nurseries.
—Ashley Miznazi, Miami Herald, 10 Oct. 2025
Called Redwing, the underwater robotic glider is being launched from Martha’s Vineyard in Massachusetts.
—Prabhat Ranjan Mishra, Interesting Engineering, 10 Oct. 2025
Where things get shaky is just about everywhere else, as Malkin’s game at 39 has dramatically fallen off, and the rest of the veterans are going to be underwater against most teams.
—James Mirtle, New York Times, 8 Oct. 2025
See All Example Sentences for underwater
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show current usage.
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Shane Croucher, MSNBC Newsweek, 10 Oct. 2025
The company, fittingly called Everglades Oysters, is built around a 74-acre underwater farm surrounded by the maze of mangroves that make up the 10,000 Islands National Wildlife Refuge and on the fringe of one of Florida’s most productive bull shark nurseries.
—Ashley Miznazi, Miami Herald, 10 Oct. 2025
Called Redwing, the underwater robotic glider is being launched from Martha’s Vineyard in Massachusetts.
—Prabhat Ranjan Mishra, Interesting Engineering, 10 Oct. 2025
Where things get shaky is just about everywhere else, as Malkin’s game at 39 has dramatically fallen off, and the rest of the veterans are going to be underwater against most teams.
—James Mirtle, New York Times, 8 Oct. 2025
See All Example Sentences for underwater
Cite this Entry
“Underwater.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underwater. Accessed 17 Oct. 2025.
Copy CitationKids Definition
underwater
adjective
un·der·wa·ter
ˈən-dər-ˈwȯt-ər
-ˈwät-
: lying, growing, worn, performed, or operating below the surface of the water
underwater plants
an underwater cave
underwater
adverb
-ˈwȯt-
-ˈwät-
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