A friend who is willing to provide honest, direct advice or criticism to help one correct their mistakes.

(literary) honest and direct advice offered to urge someone to correct their mistakes

A dwarf mentioned in ancient legends and myths.

an official who dares to speak out frankly and point out the faults of the emperor or ruler

to argue or contest a legal case; to be involved in litigation

(literary) to offer blunt or frank criticism to a superior in order to correct their mistakes; to remonstrate with. Also written [[谏诤|諫諍|jian4 zheng4]]

(literary) to frankly criticize or advise a superior; to admonish or dissuade someone in a higher position