pendulum
/ˈpendjuləm; ?@ -dʒuləm; `pɛndʒələm/ n
1 weight hung on a cord from a fixed point so that it can swing freely 摆; 摆锤.
2 rod with a weight at the bottom that regulates the mechanism of a clock 钟摆. =>illus 见插图.
3 (idm 习语) the swing of the pendulum => swing2.