NOTHING BUT THE TRUTH. The topic of this article may not meet Wikipedia's general notability guideline. Definition of third degree in the Idioms Dictionary. The third degree is a euphemism for torture ("inflicting of pain, physical or mental, to extract confessions or statements"). Simenon provides many examples of lengthy questioning of suspects, although he does make plain that that the "third degree" is not to be resorted to in the case of members of certain favoured classes as noted in Maigret and the Burglar's Wife. Since 2004, Third Degree Communications, Inc. has provided comprehensive training programs designed to enhance the investigative skills of law enforcement, corrections and social services personnel.All seminars are POST Certified in CA and NV. About Us See more. third degree phrase. Third-degree definition, to subject to the third degree. What does third degree expression mean? Third degree (interrogation) Jump to navigation Jump to search.