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casus belli (n.)
[casus belli 词源字典]
1849, from Latin
casus
"case" (see
case
(n.1)) +
belli
, genitive of
bellum
"war" (see
bellicose
). An act justifying war.
[casus belli etymology, casus belli origin, 英语词源]
[casus belli 词源字典]