verb
to sink below the surface of water or another liquid
adverb
in a submerged position or condition
preposition
to be classified or categorized as
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The company may go under if they do not secure additional funding.
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I heard that the restaurant might go under because of the lack of customers.
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If we don't get more sales, our business could totally go under.
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I feel like I'm starting to go under with all the stress from work.