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English definition of “pendulum”

pendulum

noun uk   /ˈpen.djʊ.ləm/ us    /-dʒə.ləm/
[C] a device consisting of a weight on a stick or thread that moves from one side to the other, especially one that forms a part of some types of clocks: The pendulum in the grandfather clock swung back and forth. The spaceship's jets were fired periodically to dampen a side-to-side pendulum motion that had developed.Watches and clocks [S] a change, especially from one opinion to an opposite one: As so often in education, the pendulum has swung back to the other extreme and testing is popular again.Changing your mind
(Definition of pendulum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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