- cold-blooded (adj.)
[cold-blooded 词源字典]
- also cold blooded; 1590s, of persons, "without emotion, unfeeling;" of actions, from 1828. The phrase refers to the old notion that blood temperature rose with excitement. In the literal sense, of reptiles, etc., from c. 1600. From cold (adj.) + blood (n.). Related: Cold-bloodedly; cold-bloodedness.[cold-blooded etymology, cold-blooded origin, 英语词源]