IPA: //saʊθˈwɛstərli//
KK: /sɑʊθˈwɛstərli/
Describing something that comes from or is located in the direction of the southwest.
The wind was blowing in a southwesterly direction, bringing warm air from the ocean.
In the direction of the southwest.
The wind blew southwesterly, bringing warmer temperatures.
Southwesterly is formed from "south" (from Old English "sūþ", meaning the direction toward the south) and "west" (from Old English "west", meaning the direction toward the west) combined with the suffix "-erly" (meaning in the manner of or relating to). The word describes a direction that is toward the southwest, combining the two cardinal directions.
Think of the direction 'south' and 'west' coming together, and remember that 'southwesterly' means relating to the direction that is between south and west.