Present participle of chackle; currently making clicking or sputtering sounds, or used as an adjective to describe something making these sounds.
From 'chackle' (verb) with the present participle suffix '-ing,' which derives from Old English '-ung' and marks ongoing or habitual actions.
The '-ing' ending is so old and so common that it's baked into our grammar—we use it for both present participles ('I am running') and gerunds ('Running is fun') without thinking about it!
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