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Phrase Meanings » go under
What does "go under" mean?
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Suffer defeat or destruction; fail. For example, We feared the business would go under after the founder died. [Mid-1800s]
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Lose consciousness. For example, Ether was the first anesthetic to make patients go under quickly and completely. This usage dates from the 1930s.
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Submerge, sink, as in This leaky boat is about to go under.
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