Found 2 items, similar to casus belli.
English → English (WordNet) Definition: casus belli casus belli n : an event used to justify starting a war
English → English (gcide) Definition: Casus belli Casus \Ca"sus\, n. [L.] An event; an occurrence; an occasion; a combination of circumstances; a case; an act of God. See the Note under Accident. [1913 Webster] Casus belli, an event or combination of events which is a cause war, or may be alleged as a justification of war. Casus fortuitus, an accident against which due prudence could not have provided. See Act of God, under Act. Casus omissus, a case not provided for by the statute. [1913 Webster]