自告奮勇

Self; oneself; private; personal; from; since; naturally; as a matter of course; surname.

To tell or announce; to report or inform; to accuse or denounce; to file a lawsuit; a public announcement; a lawsuit; a vacation.

To exert oneself; to strive; to rouse oneself; to be brave and fearless; to flap wings; to raise or vibrate.

Brave; courageous; valiant; bold; daring; having courage; a soldier (historical term in Qing dynasty China).