The direction or point on the mariner's compass halfway between southwest and west-southwest, or 123°45ʹ west of due north.(noun)
Toward or from southwest by west.(adverb)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.