The present participle of bestick; the act of piercing, sticking, or studding something with pointed objects.
From bestick + -ing (present participle). The archaic verb bestick combined with standard English gerund formation.
Like most archaic verbs with be- prefix, 'besticking' survives mainly in historical literature and has been replaced by simpler alternatives—it's a reminder that English is constantly shedding complex verb forms in favor of more straightforward expressions.
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