clockwork

noun
clock*work \ ˈkläk-ˌwərk \
1628{ds||1||}
  • the inner workings of something
  • the machinery (such as springs and a train of gears) that run a clock; also : a similar mechanism running a mechanical device (such as a toy)
  • the precision, regularity, or absence of variation associated with a clock or clockwork —used in the phrase like clockwork to describe something that happens or works in a regular and exact way
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