(1):

(n.) The act of throwing upward; a rising and falling suddenly; a rolling and tumbling.

(2):

(n.) A process for refining tin by dropping it through the air while melted.

(3):

(n.) 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.

(4):

(p. pr. & vb. n.) of Toss