IPA: /ˈwɪdəʃɪnz/
KK: /ˈwɪdərʃɪnz/
In a direction that is opposite to the usual or expected, often counterclockwise.
The leaves swirled widdershins in the autumn wind.
Widdershins → The word originates from Middle English *widdershins*, which is derived from the Old High German *wider* (meaning against) and *sin* (meaning direction or way). It refers to the direction that is contrary to the sun's course, or counterclockwise.
Think of going 'against' ('wider') the usual 'direction' ('sin') of the sun — that's why widdershins means to move counterclockwise.