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
sweat (something) out or sweat out (something)
to wait anxiously for something, to worry about something
I spent the day sweating out whether or not I would get the job.