merry-go-round

/ˈmɛ.ɹi.ɡoʊ.ɹaʊnd/
noun
  1. 1

    A carousel; a pleasure ride, typically found at fairs and amusement parks, consisting of a slowly revolving circular platform on which various seats are fixed, frequently shaped like horses or other animals.

  2. 2

    A piece of playground equipment consisting of a circular platform that is made to revolve by pushing while users stand on it.

  3. 3

    A meaningless cycle; a bustle of activity that gets nowhere

  4. 4

    A freight train of hopper goods wagons which loads and unloads its cargo while moving.

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Source: https://en.wiktionary.org/wiki/merry-go-round