To sing or utter in falsetto.
A person who sings in falsetto.
The "false" (singing) voice in any human, usually airy and lacking a purity of vowels; created by utilizing the next highest vocal folds above those used for speech and normal range singing. It is commonly confused with the head voice register.
To resonate.
To use vibrato.
To affect with vibratory motion; to set in vibration.
To brandish; to swing to and fro.
To shake with small, rapid movements to and fro.
To mark or measure by moving to and fro.
The setting, on a portable electronic device, that causes it to vibrate rather than sound any (or most) needed alarms.