south by west

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The compass point halfway between south and south-southwest, specifically 191.25°, abbreviated as SbW.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the compass point that is one point west of due south