sangfroid

the word 'sangfroid' entered english in the 18th century, borrowed directly from the french phrase 'sang-froid', which literally means 'cold blood'. this french term itself is a calque, or loan translation, of the latin phrase 'sanguis frigidus'. the underlying logic is ancient and cross-cultural, equating emotional calmness and steady nerve with a physical state of coolness, in contrast to the heat of passion or panic. this metaphorical link between temperature and temperament has persisted, with the modern english word retaining the sophisticated, unflappable composure implied by its french origins.

this word is a direct loanword from french. it is not segmented into meaningful morphemes in english, as its components are not productive in the english language system.