In the opposite direction from the way the hands of a clock move; counterclockwise (primarily British English).
From anti- (against, opposite) + clockwise (in the direction clock hands move). This term became standardized in British English while American English preferred 'counterclockwise.'
The Coriolis effect makes water swirl anticlockwise in the Southern Hemisphere and clockwise in the Northern Hemisphere, which is why language divided into 'anticlockwise' and 'counterclockwise' along the same geographic lines.
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