One that chirrups; something that produces chirruping sounds.
Formed with the agent suffix '-er' added to the doubled form of 'chirrup' (chirrupp-), following English morphology rules when the '-er' is added to verbs with doubled final consonants.
The doubling of 'p' before adding '-er' might seem arbitrary, but it's a systematic rule in English that keeps pronunciation consistent—it's like the language has its own secret spelling code.
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