Definitions from Wiktionary ( )

▸ noun:  A short, sharp or high note or noise, as of a bird or insect.
▸ noun:  (radar, sonar, radio telescopy etc.) A pulse of signal whose frequency sweeps through a band of frequencies for the duration of the pulse.
▸ verb:  (intransitive) To make a short, sharp, cheerful note, as of small birds or crickets; to chitter; to twitter.
▸ verb:  (intransitive) To speak in a high-pitched staccato.
▸ verb:  (transitive, radar, sonar, radio telescopy etc.) To modify (a pulse of signal) so that it sweeps through a band of frequencies throughout its duration.
▸ verb:  (transitive, obsolete) To cheer up; to make (someone) happier.
▸ verb:  (Canada) To speak rapid insulting comical banter back and forth.
▸ verb:  (UK, slang, obsolete) To inform on someone; snitch.

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