How do you spell Athwart

Available Definitions:
1)  prep. - Across; from side to side of.
2)  prep. - Across the direction or course of; as, a fleet standing athwart our course.
3)  adv. - Across, especially in an oblique direction; sidewise; obliquely.
4)  adv. - Across the course; so as to thwart; perversely.