noun
a downward movement or fall
verb
to move downward below the surface of a liquid or soft substance
adjective
causing or experiencing a feeling of decline or despair
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The ship was slowly sinking as water filled the hull.
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I heard that company is sinking fast, they might go out of business soon.
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His grades are sinking like a rock, he needs to start studying.
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Her heart felt like it was sinking as she watched him walk away.