south by west

the direction, or the point on a mariner's compass, halfway between due south and south-southwest; 11°15′ west of due south

See south by west in American Heritage Dictionary 4

noun Abbr. SbW
The direction or point on the mariner's compass halfway between due south and south-southwest, or 168°45: west of due north.
adverb & adj.
Toward or from south by west.
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