third degree

Etymology
Attested from 1900. The phrase, meaning "intense interrogation by police," likely refers to the Third Degree of Master Mason in Freemasonry, the ceremony for which included an interrogation. Alternatively, it reflects the practice of interrogation under torture, where three degrees of torture were recognised, of increasing intensity. In other contexts, three degrees of interrogation were recognised, with torture being the third degree.

Noun

 * 1)  Intensive rough interrogation in order to extract information or a confession

Usage notes
Chiefly used in the expression give someone the third degree.

Translations

 * Spanish: tercer grado