1
Stage 1 of 3
sanguis + frigidus
Latin · ancient
"cold blood"
'blood' and 'cold' combined
2
Stage 2 of 3
sang froid
French · 1600s-1700s
"coolness, composure"
literally 'cool blood', a metaphor for emotional composure under pressure
3
Stage 3 of 3
sang-froid
English · 1712
"presence of mind, composure"
borrowed whole for unflappable presence of mind
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