3 adverb
south3 written abbreviation S
1SG towards the south:
Most of the birds had already flown south.
south of
a seaside town 99 km south of London
a south-facing garden

down south

a) British English informalSG in or to the southern part of England:
We moved down south about five years ago.
b) American English also down South in or to the southern US states:
His sister lives down south.

go south

American English informal if a situation, organization, or set of standards goes south, it becomes very bad although it was once very good:
It seems like all our moral standards have just gone south.

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