Etymology
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sang-froid (n.)

also sangfroid, "presence of mind, coolness, mental composure," 1712, from French sang froid, literally "cool blood," from sang "blood" (from Latin sanguis; see sanguinary) + froid "cold" (from Latin frigidus; see frigid). "In the 17th c. the expression was in France often written erroneously sens froid, as if it contained sens "sense" instead of the homophonous sang "blood'." [OED].

updated on December 10, 2021

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Definitions of sang-froid from WordNet

sang-froid (n.)
great coolness and composure under strain;
Synonyms: aplomb / assuredness / cool / poise
From wordnet.princeton.edu, not affiliated with etymonline.