It's a simile because a simile a coparison between two things that are not alike and replaces a word with another word. Also uses the words, like or as.
Ennui is a French word meaning boredom or discontent. A) Nacht in German means <em>night. </em>B) Ciao in Italian means <em>hi. </em>C) Dogged in English means <em>tenacious, determined, stubborn.</em><em> </em>