- diehard
[diehard 词源字典] - also die-hard, 1844 (n.), in reference to the 57th Regiment of Foot in the British Army; as an adjective, attested from 1871; from die (v.) + hard (adv.). As a brand name of an automobile battery, DieHard, introduced by Sears in 1967.[diehard etymology, diehard origin, 英语词源]
