The difference between Underwater and Upside down
When used as adverbs, underwater means going beneath the surface of the water, whereas upside down means inverted, so that the top is now at the bottom.
When used as adjectives, underwater means beneath the surface of the water, or of or pertaining to the region beneath the water surface, whereas upside down means inverted.
Underwater is also noun with the meaning: underlying water or body of water, for example in an aquifer or the deep ocean.
Underwater is also verb with the meaning: to water or irrigate insufficiently.
check bellow for the other definitions of Underwater and Upside down
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Underwater as an adjective (not comparable):
beneath the surface of the water, or of or pertaining to the region beneath the water surface
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Underwater as an adjective (nautical):
beneath the water line of a vessel
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Underwater as an adjective (figuratively):
Under water.
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Underwater as an adjective (finance):
having negative equity; owing more on an asset than its market value
Examples:
"We've been underwater on our mortgage ever since the housing crash."
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Underwater as an adverb:
going beneath the surface of the water
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Underwater as a noun:
underlying water or body of water, for example in an aquifer or the deep ocean
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Underwater as a noun (fishing):
A type of lure which lies beneath the water surface.
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Underwater as a verb (agriculture, horticulture):
to water or irrigate insufficiently
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Upside down as an adverb:
Inverted, so that the top is now at the bottom.
Examples:
"The Union flag was flying upside down, a sign of danger."
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Upside down as an adverb:
In great disorder.
Examples:
"The thief had turned the room upside down."
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Upside down as an adjective:
Inverted; turned so that the top is at the bottom.
Examples:
"The pattern resembled an upside down letter W."
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Upside down as an adjective:
In great disorder.
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Upside down as an adjective (finance):
Owing more money for something than it is worth; having negative equity.
Examples:
"He's upside down on his mortgage."