The present participle of fang; the action of piercing, seizing, or injecting with fangs, or the biological process of growing or developing fangs.
From fang (noun/verb, originally 'to seize') plus the -ing suffix, creating the continuous or habitual form.
In snake biology, 'fanging' refers to when a young snake develops its functional fangs and becomes venomous—it's a critical moment because suddenly the baby snake becomes genuinely dangerous.
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