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southwest by south

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

See southwest by south in American Heritage Dictionary 4

noun Abbr. SWbS
The direction or point on the mariner's compass halfway between southwest and south-southwest, or 146°15: west of due north.
adverb & adj.
Toward or from southwest by south.
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