down under prepositional phrase 4noun 1 prepositional phrase4 •In Australia.Surfing is a popular sport down under. •Into Australia; to Australia.We traveled down under for our holiday. •By extension, anywhere, or to anywhere, south of the Equator •(euphemistic, rare) Hell; in Hell. noun1 •(slang, euphemistic) The genitalia; the groin area.
