Definitions:
" a wind blowing from the west; = ""westerly"".

situated or lying (further) to the west; western, westerly. frequently in place names (especially in scotland and newfoundland).

of the sun or other celestial object: to travel westward in its course; to decline towards the west.

of the wind: to change to a more westerly direction; to blow more strongly from the west.

to move (further) west; in later use especially with reference to migration westward across north america.

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