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Definitions

casus belli

[key-suhs bel-ahy, bel-ee, kah-soos bel-lee] / ˈkeɪ səs ˈbɛl aɪ, ˈbɛl i, ˈkɑ sʊs ˈbɛl li /


NOUN
root of the matter
Synonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In his speech announcing the war, Mr. Trump explained the extensive casus belli to the American people.

From The Wall Street Journal • Mar. 2, 2026

Rather, this narrow goal may be intended to serve as an official casus belli, giving Russian diplomats something to cite, however implausible, particularly at the United Nations.

From New York Times • Feb. 24, 2022

The comments prompted alarm among U.S. officials who feared he was once again formulating a casus belli ahead of possible new military action against Ukraine.

From Washington Post • Feb. 3, 2022

One of the few voices that challenged Polk’s casus belli was Abraham Lincoln, then serving in Congress.

From The New Yorker • May 13, 2019

The casus belli was usually the desire to avenge an insult or gain status, not the wish for conquest.

From "1491" by Charles C. Mann




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