Present participle of chirrup; the act of making repeated short, sharp sounds.
Formed by adding the '-ing' suffix to 'chirrup' (doubling the final 'p' before adding '-ing' due to the short vowel before it), following standard English gerund formation rules.
The '-ing' ending is magical because it captures an action happening right now—when you say 'chirruping,' you can almost hear the ongoing sound frozen in the word itself.
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