Also Sw (for defs 2, 3).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for sw
Now I understand why you whisper even when you sw—that is, when you break a plate.The Woman-Haters
Joseph C. Lincoln
No kyards is permitted; an', moreover, you've got to go outdoors to sw'ar.Faro Nell and Her Friends
Alfred Henry Lewis
I do not know who first noticed and recorded this change of the wind from SW.
It was therefore judged prudent to shift the vessel to the SW.
In the course of the last night, the wind had shifted from SW.
- short wave