Toss"ing, n.
1.
The act of throwing upward; a rising and falling suddenly; a rolling and tumbling.
2. Mining (a)
A process which consists in washing ores by violent agitation in water, in order to separate the lighter or earhy particles; -- called also tozing, and treloobing, in Cornwall.
Pryce. (b)
A process for refining tin by dropping it through the air while melted.
© Webster 1913.