Other forms: chirping; chirped; chirps
A chirp is the short, high sound a bird makes. The chirps of the robins at your bird feeder through the open window might drive your cat crazy.
Birds chirp — you could also say they tweet, twitter, cheep, and warble — and some insects chirp too. An extremely cheerful person also chirps: "The overly enthusiastic tour guide chirps happily as the bus moves through the city." Chirp may have developed as an imitation of the sound itself, or it may stem from the Middle English chirken, "twitter," which is rooted in the Old English cearcian, "to creak."
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