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hard-boiled (adj.)
[hard-boiled 词源字典]
also
hardboiled
, 1723 in reference to eggs, "cooked so long as to be solid," from
hard
(adj.) +
boiled
. In transferred sense "severe, tough," from 1886.
[hard-boiled etymology, hard-boiled origin, 英语词源]
[hard-boiled 词源字典]