Etymology
Advertisement
back up (v.)

1767, "stand behind and support," from back (v.) + up (adv.). The meaning "move or force backward" is by 1834. Of water prevented from flowing, by 1837.

Related entries & more 
Advertisement
art nouveau 

decorative, design, and architectural style popular from c. 1890 to World War I, characterized by intricate designs and flowing curves based on natural forms, 1900, from French l'art nouveau (by 1895), literally "new art" (see novel (adj.)). Called in German Jugendstil.

Related entries & more