The term is a modern English compound, formed by combining the cardinal and intercardinal points of the compass. The logic is purely descriptive and directional, originating from the Germanic root words for the cardinal directions 'west' and 'south'. These Old English terms have ancient Indo-European origins, with 'west' linked to the concept of evening and the setting sun. The compound 'west-southwest' follows a standard navigational convention, where the primary direction ('west') is modified first by a secondary direction ('south') and then reaffirmed by the primary direction again to specify a precise point on the compass rose between the two named points.

Structure: west (direction) + south (direction) + west (direction) - west: From Old English 'west', of Germanic origin; related to Latin 'vesper' (evening). Denotes the cardinal direction. - south: From Old English 'sūth', of Germanic origin. Denotes the cardinal direction. - west: From Old English 'west', as above. Denotes the cardinal direction.