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Love makes the world go `round

Cultural  

  1. Love is the principal force behind human life. In medieval theology, it was held that love literally set the universe in motion.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.