To yell out; to vocalize audibly; announce.
To contact one's workplace and announce that one is unable to attend work. Regionalism short for call out sick; much more commonly: call in sick.
To challenge, criticize, denounce.
To specify, especially in detail.
To order into service; to summon into service.
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.