Definitions
1.nounA short, sharp or high note or noise, as of a bird or insect.
2.noun(radar, sonar, radio telescopy etc.) A pulse of signal whose frequency sweeps through a band of frequencies for the duration of the pulse.
3.verbTo make a short, sharp, cheerful note, as of small birds or crickets
4.verbTo speak in a high-pitched staccato
5.verb(radar, sonar, radio telescopy etc.) To modify (a pulse of signal) so that it sweeps through a band of frequencies throughout its duration.
6.verbTo cheer up; to make (someone) happier.