Present participle: the ongoing process of tissue being damaged by extreme freezing cold.
The present participle form of 'frostbite' (as a verb), formed by adding '-ing' to the verb stem. This creates a gerund or continuous action form, following standard English verb conjugation patterns.
The '-ing' suffix transforms any verb into a description of continuous action, which is why 'frostbiting' instantly communicates something actively happening—our brains understand the ongoing process without needing extra explanation.
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