Meaning of PENDULUM in English
n. a weight suspended so as to swing freely, esp. a rod with a weighted end regulating the movement of a clock's works.
Phrases and idioms:
swing of the pendulum the tendency of public opinion to oscillate between extremes, esp. between political parties.
Etymology: L neut. adj. (as PENDULOUS)
Oxford English vocab. Оксфордский английский словарь. 2012