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Difference between Down below and Down under

down below

1. in a lower part of a building, ship, etc.:

  • Someone was with me and we proceeded to open the hatch to the flooded compartment down below.

2. under the ocean or sea:

  • Wherever there’s a lot of seaweed at the surface, you will probably find some sort of big fish down below.

down under—(coll.) said of Australia or New Zealand:

  • The last time I was Down Under was ten years ago. It was my second visit to Australia.

See also: down here / here below.