Pendulate
The Century Dictionary and Cyclopedia
To hang or swing freely; swing; dangle; vibrate as a pendulum.
the GNU version of the Collaborative International Dictionary of English
intransitive verb.
To swing as a pendulum.
Wiktionary, Creative Commons Attribution/Share-Alike License
verb.
To
swing
like a
pendulum
.
Word Usage
"The reticule ceased to pendulate, the conversation stopped abruptly, the boy and girl stood profoundly astonished."