n.
1.a war between the allies (Russia, France, British Empire, Italy, United States, Japan, Rumania, Serbia, Belgium, Greece, Portugal, Montenegro) and the central powers (Germany, Austria-Hungary, Turkey, Bulgaria) from 1914 to 1918
Idiom of the Day
knock (someone or something) out or knock out (someone or something)
to make someone unconscious, to make something unworkable or unusable
The storm last night knocked out power in most of the town.