noun
striking clock; wall clock with chime; pendulum clock
Refers to a clock that strikes the hour, often a wall-mounted pendulum clock with a chime. The name is onomatopoeic from the 'bon-bon' sound.
祖母の家には古いぼんぼん時計がある。
There is an old striking clock at my grandmother's house.
ぼんぼん時計が三時を知らせた。
The striking clock announced three o'clock.