(n.) To rejoice; to be pleased; -- often used, in Old English, impersonally with dative.
(v. i.) Animals pursued and taken by sportsmen; wild meats designed for, or served at, table.
Discourse and Truth M. FOUCAULT
So you see, the parrhesiastes is someone who takes a risk. Of course, this risk is not always a risk of life. When, for example, you see a friend doing something wrong and you risk incurring his anger by telling him he is wrong, you are acting as a parrhesiastes. In such a case, you do not risk your life, but you may hurt him by your remarks, and your friendship may consequently suffer for it. If, in a political debate, an orator risks losing his popularity because his opinions are contrary to the majority's opinion, or his opinions may usher in a political scandal, he uses parrhesia. Parrhesia, then, is linked to courage in the face of danger: it demands the courage to speak the truth in spite of some danger. And in its extreme form, telling the truth takes place in the "game" of life or death.
It is because the parrhesiastes must take a risk in speaking the truth that the king or tyrant generally cannot use parrhesia; for he risks nothing.