The compound noun "witness-protection" is a modern legal and law enforcement term formed from two deeply rooted English words. "Witness" originates from the Proto-Germanic concept of knowledge and seeing, evolving from Old English to specifically denote one who gives testimony. "Protection" stems from the Latin idea of shielding or covering something from harm. The compound logically combines these elements: the person (the one who knows/sees and testifies) and the state action (the systematic shielding from danger), creating a specific term for a program that safeguards informants. This evolution from literal "knowledge" and "covering" to an abstract, institutionalized security procedure reflects the development of complex judicial and social systems.

Structure: witness (one who sees) + protection (act of shielding) - witness: From Old English 'witnes', meaning "knowledge, testimony," from 'witan' ("to know") + the noun-forming suffix '-nes'. Its functional role is the core noun, identifying the person being protected. - protection: From Latin 'protectionem' ("a covering over"), from 'protegere' ("to cover in front"). Its functional role is the head noun, indicating the action or system applied to the witness.