south by west

from The American Heritage® Dictionary of the English Language, 4th Edition

• n. The direction or point on the mariner's compass halfway between due south and south-southwest, or 168°45ʹ west of due north.
• adv. Toward or from south by west.

from Wiktionary, Creative Commons Attribution/Share-Alike License

• n. 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.

• n. the compass point that is one point west of due south