noun The sound of a succession of chirps as uttered by birds.
I often listen to the twitter of the birds in the park.
noun Unwanted flicker that occurs in interlaced displays when the image contains vertical detail that approaches the horizontal resolution of the video format.
noun A tremulous broken sound.
noun A slight trembling of the nerves.
noun Chiefly in the form in a twitter: a state of excitement or nervousness; a twit.
verb To utter a succession of chirps.
verb To talk in an excited or nervous manner.
verb To make the sound of a half-suppressed laugh; to titter; to giggle.