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Difference between Go below and Go under

go below—(Nautical) go to the lower (underwater) levels in a ship:

  • Nora and I went below to our bunks to make our beds and settle in before the ship left the channel.

go under

1. (of a person or ship) go below the surface of the sea:

  • Our boat went under in no time at all. Some time later the submarine approached us, spraying machine gun tracer bullets….

2. (of a business) fail:

  • A few weeks before the company went under he checked to see if his pension was safe.

3. lose consciousness under the action of anesthesia, etc.:

  • No one trained in administering anesthesia was dedicated to that task alone in his operating room as she went under.

See also: come down / go down.