The act or sport of spinning logs with your feet while standing on them; log-rolling. Also, in another sense, the act of entertaining or carousing.
Present participle of 'birl,' formed by adding '-ing.' The gerund creates a noun referring to the activity itself, which became the standard name for the log-rolling sport.
Birling is literally a sport where you try to knock your opponent off a spinning log using just your feet and balance—it was such a big deal in logging culture that it became an organized international sport!
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