(politics, conspiracy research) A large group of people, typically members of government agencies and the military, believed to have long-lasting political influence that is difficult for an administration voted into power to counter.

at heart, deep down

(logic, uncountable) The act of representing one language, typically a logic or programming language, with another by modeling expressions in the former as data in the latter.

Synonym of diaphragmatic breathing

Alternative spelling of deep breathing.

Set deeply below a surface, as on a face. / (figuratively) firmly in place; long-standing

(idiomatic) Placed in a complex situation (especially work-related) without adequate preparation or experience.

(Australia, sometimes derogatory) Queensland, sometimes with the addition of the Northern Territory.

To form relatively deep objects in sheet metal using a die

(slang, vulgar) Having the penis fully immersed in an orifice, more often the anus or vagina than the mouth. / (slang, vulgar) Fully committed to a situation.